diff --git a/workflow/engine/src/ProcessMaker/BusinessModel/Calendar.php b/workflow/engine/src/ProcessMaker/BusinessModel/Calendar.php
index 2df0651d4..8d7d14bd2 100644
--- a/workflow/engine/src/ProcessMaker/BusinessModel/Calendar.php
+++ b/workflow/engine/src/ProcessMaker/BusinessModel/Calendar.php
@@ -221,7 +221,7 @@ class Calendar
             $obj = \CalendarDefinitionPeer::retrieveByPK($calendarUid);
 
             if (!(is_object($obj) && get_class($obj) == "CalendarDefinition")) {
-                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $calendarUid), "The calendar with {0}: {1} does not exists");
+                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $calendarUid), "The calendar with {0}: {1} does not exist.");
 
                 throw (new \Exception($msg));
             }
@@ -301,7 +301,7 @@ class Calendar
             if (isset($arrayData["CAL_WORK_HOUR"])) {
                 foreach ($arrayData["CAL_WORK_HOUR"] as $value) {
                     if ($value["DAY"] != "ALL" && !in_array($value["DAY"], $arrayData["CAL_WORK_DAYS"])) {
-                        throw (new \Exception(str_replace(array("{0}", "{1}"), array($this->arrayWorkHourFieldNameForException["day"], $this->arrayFieldNameForException["calendarWorkDays"]), "Value specified for \"{0}\" does not exists in \"{1}\"")));
+                        throw (new \Exception(str_replace(array("{0}", "{1}"), array($this->arrayWorkHourFieldNameForException["day"], $this->arrayFieldNameForException["calendarWorkDays"]), "Value specified for \"{0}\" does not exist in \"{1}\".")));
                     }
 
                     $arrayCalendarWorkHour[] = array(
@@ -408,7 +408,7 @@ class Calendar
 
             foreach ($arrayAux as $value) {
                 if (isset($arrayData["CAL_WORK_HOUR"]) && $value["DAY"] != "ALL" && !in_array($value["DAY"], $calendarWorkDays)) {
-                    throw (new \Exception(str_replace(array("{0}", "{1}"), array($this->arrayWorkHourFieldNameForException["day"], $this->arrayFieldNameForException["calendarWorkDays"]), "Value specified for \"{0}\" does not exists in \"{1}\"")));
+                    throw (new \Exception(str_replace(array("{0}", "{1}"), array($this->arrayWorkHourFieldNameForException["day"], $this->arrayFieldNameForException["calendarWorkDays"]), "Value specified for \"{0}\" does not exist in \"{1}\".")));
                 }
 
                 $arrayCalendarWorkHour[] = array(
diff --git a/workflow/engine/src/ProcessMaker/BusinessModel/CaseTrackerObject.php b/workflow/engine/src/ProcessMaker/BusinessModel/CaseTrackerObject.php
index 1f83e44b6..315ffa524 100644
--- a/workflow/engine/src/ProcessMaker/BusinessModel/CaseTrackerObject.php
+++ b/workflow/engine/src/ProcessMaker/BusinessModel/CaseTrackerObject.php
@@ -74,11 +74,11 @@ class CaseTrackerObject
             }
 
             if (!isset($arrayData["CTO_TYPE_OBJ"])) {
-                throw (new \Exception(str_replace(array("{0}"), array(strtolower("CTO_TYPE_OBJ")), "The \"{0}\" attribute is not defined")));
+                throw (new \Exception(str_replace(array("{0}"), array(strtolower("CTO_TYPE_OBJ")), "Undefined value for \"{0}\", it is required.")));
             }
 
             if (!isset($arrayData["CTO_UID_OBJ"])) {
-                throw (new \Exception(str_replace(array("{0}"), array(strtolower("CTO_UID_OBJ")), "The \"{0}\" attribute is not defined")));
+                throw (new \Exception(str_replace(array("{0}"), array(strtolower("CTO_UID_OBJ")), "Undefined value for \"{0}\", it is required.")));
             }
 
             $step = new \ProcessMaker\BusinessModel\Step();
@@ -148,11 +148,11 @@ class CaseTrackerObject
             }
 
             if (isset($arrayData["CTO_TYPE_OBJ"]) && !isset($arrayData["CTO_UID_OBJ"])) {
-                throw (new \Exception(str_replace(array("{0}"), array(strtolower("CTO_UID_OBJ")), "The \"{0}\" attribute is not defined")));
+                throw (new \Exception(str_replace(array("{0}"), array(strtolower("CTO_UID_OBJ")), "Undefined value for \"{0}\", it is required.")));
             }
 
             if (!isset($arrayData["CTO_TYPE_OBJ"]) && isset($arrayData["CTO_UID_OBJ"])) {
-                throw (new \Exception(str_replace(array("{0}"), array(strtolower("CTO_TYPE_OBJ")), "The \"{0}\" attribute is not defined")));
+                throw (new \Exception(str_replace(array("{0}"), array(strtolower("CTO_TYPE_OBJ")), "Undefined value for \"{0}\", it is required.")));
             }
 
             if (isset($arrayData["CTO_TYPE_OBJ"]) && isset($arrayData["CTO_UID_OBJ"])) {
@@ -324,7 +324,8 @@ class CaseTrackerObject
      *
      * @return void
      */
-    public function moveCaseTrackerObject($cto_uid, $pro_uid, $cto_pos) {
+    public function moveCaseTrackerObject($cto_uid, $pro_uid, $cto_pos)
+    {
         $aCaseTrackerObject = CaseTracker::getCaseTrackerObjects($pro_uid);
 
         foreach ($aCaseTrackerObject as $dataCaseTracker) {
diff --git a/workflow/engine/src/ProcessMaker/BusinessModel/DynaForm.php b/workflow/engine/src/ProcessMaker/BusinessModel/DynaForm.php
index 7e365383c..dbcc3752c 100644
--- a/workflow/engine/src/ProcessMaker/BusinessModel/DynaForm.php
+++ b/workflow/engine/src/ProcessMaker/BusinessModel/DynaForm.php
@@ -282,7 +282,7 @@ class DynaForm
             $rsCriteria = \DynaformPeer::doSelectRS($criteria);
 
             if (!$rsCriteria->next()) {
-                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $dynaFormUid), "The DynaForm with {0}: {1}, does not exist");
+                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $dynaFormUid), "The DynaForm with {0}: {1}, does not exist.");
 
                 throw (new \Exception($msg));
             }
@@ -512,27 +512,27 @@ class DynaForm
             $process->throwExceptionIfDataNotMetFieldDefinition($arrayData, $this->arrayFieldDefinition, $this->arrayFieldNameForException, true);
 
             if (!isset($arrayData["COPY_IMPORT"])) {
-                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("COPY_IMPORT")), "The \"{0}\" attribute is not defined")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("COPY_IMPORT")), "Undefined value for \"{0}\", it is required.")));
             }
 
             if (!isset($arrayData["COPY_IMPORT"]["PRJ_UID"])) {
-                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("COPY_IMPORT.PRJ_UID")), "The \"{0}\" attribute is not defined")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("COPY_IMPORT.PRJ_UID")), "Undefined value for \"{0}\", it is required.")));
             }
 
             $arrayData["COPY_IMPORT"]["PRJ_UID"] = trim($arrayData["COPY_IMPORT"]["PRJ_UID"]);
 
             if ($arrayData["COPY_IMPORT"]["PRJ_UID"] == "") {
-                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("COPY_IMPORT.PRJ_UID")), "The \"{0}\" attribute is empty")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("COPY_IMPORT.PRJ_UID")), "Invalid value for \"{0}\", it can not be empty.")));
             }
 
             if (!isset($arrayData["COPY_IMPORT"]["DYN_UID"])) {
-                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("COPY_IMPORT.DYN_UID")), "The \"{0}\" attribute is not defined")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("COPY_IMPORT.DYN_UID")), "Undefined value for \"{0}\", it is required.")));
             }
 
             $arrayData["COPY_IMPORT"]["DYN_UID"] = trim($arrayData["COPY_IMPORT"]["DYN_UID"]);
 
             if ($arrayData["COPY_IMPORT"]["DYN_UID"] == "") {
-                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("COPY_IMPORT.DYN_UID")), "The \"{0}\" attribute is empty")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("COPY_IMPORT.DYN_UID")), "Invalid value for \"{0}\", it can not be empty.")));
             }
 
             $this->throwExceptionIfExistsTitle($processUid, $arrayData["DYN_TITLE"], $this->arrayFieldNameForException["dynaFormTitle"]);
@@ -715,29 +715,29 @@ class DynaForm
             $process->throwExceptionIfDataNotMetFieldDefinition($arrayData, $this->arrayFieldDefinition, $this->arrayFieldNameForException, true);
 
             if ($arrayData["DYN_TYPE"] == "grid") {
-                throw (new \Exception(str_replace(array("{0}"), array($this->arrayFieldNameForException["dynaFormType"]), "Invalid value specified for \"{0}\"")));
+                throw (new \Exception(str_replace(array("{0}", "{1}"), array($this->arrayFieldNameForException["dynaFormType"], "xmlform"), "Invalid value for \"{0}\", it only accepts values: \"{1}\".")));
             }
 
             if (!isset($arrayData["PMTABLE"])) {
-                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("PMTABLE")), "The \"{0}\" attribute is not defined")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("PMTABLE")), "Undefined value for \"{0}\", it is required.")));
             }
 
             if (!isset($arrayData["PMTABLE"]["TAB_UID"])) {
-                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("PMTABLE.TAB_UID")), "The \"{0}\" attribute is not defined")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("PMTABLE.TAB_UID")), "Undefined value for \"{0}\", it is required.")));
             }
 
             $arrayData["PMTABLE"]["TAB_UID"] = trim($arrayData["PMTABLE"]["TAB_UID"]);
 
             if ($arrayData["PMTABLE"]["TAB_UID"] == "") {
-                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("PMTABLE.TAB_UID")), "The \"{0}\" attribute is empty")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("PMTABLE.TAB_UID")), "Invalid value for \"{0}\", it can not be empty.")));
             }
 
             if (!isset($arrayData["PMTABLE"]["FIELDS"])) {
-                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("PMTABLE.FIELDS")), "The \"{0}\" attribute is not defined")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("PMTABLE.FIELDS")), "Undefined value for \"{0}\", it is required.")));
             }
 
             if (count($arrayData["PMTABLE"]["FIELDS"]) == 0) {
-                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("PMTABLE.FIELDS")), "The \"{0}\" attribute is empty")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName("PMTABLE.FIELDS")), "Invalid value for \"{0}\", it can not be empty.")));
             }
 
             $this->throwExceptionIfExistsTitle($processUid, $arrayData["DYN_TITLE"], $this->arrayFieldNameForException["dynaFormTitle"]);
diff --git a/workflow/engine/src/ProcessMaker/BusinessModel/Group.php b/workflow/engine/src/ProcessMaker/BusinessModel/Group.php
index 57ef66a2d..626c1adea 100644
--- a/workflow/engine/src/ProcessMaker/BusinessModel/Group.php
+++ b/workflow/engine/src/ProcessMaker/BusinessModel/Group.php
@@ -143,7 +143,7 @@ class Group
             $group = new \Groupwf();
 
             if (!$group->GroupwfExists($groupUid)) {
-                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $groupUid), "The group with {0}: {1} does not exist");
+                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $groupUid), "The group with {0}: {1} does not exist.");
 
                 throw (new \Exception($msg));
             }
diff --git a/workflow/engine/src/ProcessMaker/BusinessModel/InputDocument.php b/workflow/engine/src/ProcessMaker/BusinessModel/InputDocument.php
index 1660fa273..5880be1ca 100644
--- a/workflow/engine/src/ProcessMaker/BusinessModel/InputDocument.php
+++ b/workflow/engine/src/ProcessMaker/BusinessModel/InputDocument.php
@@ -161,7 +161,7 @@ class InputDocument
             $rsCriteria = \InputDocumentPeer::doSelectRS($criteria);
 
             if (!$rsCriteria->next()) {
-                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $inputDocumentUid), "The Input Document with {0}: {1} does not exist");
+                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $inputDocumentUid), "The Input Document with {0}: {1} does not exist.");
 
                 throw (new \Exception($msg));
             }
diff --git a/workflow/engine/src/ProcessMaker/BusinessModel/Process.php b/workflow/engine/src/ProcessMaker/BusinessModel/Process.php
index ab22db6da..67e8d975f 100644
--- a/workflow/engine/src/ProcessMaker/BusinessModel/Process.php
+++ b/workflow/engine/src/ProcessMaker/BusinessModel/Process.php
@@ -176,7 +176,7 @@ class Process
                     $fieldNameAux = (isset($arrayFieldNameForException[$arrayFieldDefinition[$fieldName]["fieldNameAux"]]))? $arrayFieldNameForException[$arrayFieldDefinition[$fieldName]["fieldNameAux"]] : "";
 
                     if ($arrayFieldDefinition[$fieldName]["required"] && !isset($arrayData[$fieldName])) {
-                        throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "The \"{0}\" attribute is not defined")));
+                        throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "Undefined value for \"{0}\", it is required.")));
                     }
                 }
             }
@@ -201,12 +201,12 @@ class Process
                         case 1:
                             //empty
                             if (!$arrayFieldDefinition[$fieldName]["empty"] && trim($fieldValue) . "" == "") {
-                                throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "The \"{0}\" attribute is empty")));
+                                throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "Invalid value for \"{0}\", it can not be empty.")));
                             }
 
                             //defaultValues
                             if (count($arrayFieldDefinition[$fieldName]["defaultValues"]) > 0 && !in_array($fieldValue, $arrayFieldDefinition[$fieldName]["defaultValues"])) {
-                                throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "Invalid value specified for \"{0}\"")));
+                                throw (new \Exception(str_replace(array("{0}", "{1}"), array($fieldNameAux, implode("|", $arrayFieldDefinition[$fieldName]["defaultValues"])), "Invalid value for \"{0}\", it only accepts values: \"{1}\".")));
                             }
 
                             //type
@@ -220,17 +220,17 @@ class Process
                                 switch ($arrayFieldDefinition[$fieldName]["type"]) {
                                     case "date":
                                         if (!preg_match("/^" . $eregDate . "$/", $fieldValue)) {
-                                            throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "Invalid value specified for \"{0}\"")));
+                                            throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "Invalid value for \"{0}\".")));
                                         }
                                         break;
                                     case "hour":
                                         if (!preg_match("/^" . $eregHour . "$/", $fieldValue)) {
-                                            throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "Invalid value specified for \"{0}\"")));
+                                            throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "Invalid value for \"{0}\".")));
                                         }
                                         break;
                                     case "datetime":
                                         if (!preg_match("/^" . $eregDatetime . "$/", $fieldValue)) {
-                                            throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "Invalid value specified for \"{0}\"")));
+                                            throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "Invalid value for \"{0}\".")));
                                         }
                                         break;
                                 }
@@ -242,7 +242,7 @@ class Process
                                     //type
                                     if (!is_array($fieldValue)) {
                                         if ($fieldValue != "" && !preg_match("/^\s*array\s*\(.*\)\s*$/", $fieldValue)) {
-                                            throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "The \"{0}\" attribute is not array")));
+                                            throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "Invalid value for \"{0}\", this value must be an array.")));
                                         }
                                     }
 
@@ -259,7 +259,7 @@ class Process
                                         }
 
                                         if (count($arrayAux) == 0) {
-                                            throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "The \"{0}\" attribute is empty")));
+                                            throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "Invalid value for \"{0}\", it can not be empty.")));
                                         }
                                     }
 
@@ -277,7 +277,7 @@ class Process
 
                                         foreach ($arrayAux as $value) {
                                             if (!in_array($value, $arrayFieldDefinition[$fieldName]["defaultValues"])) {
-                                                throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "Invalid value specified for \"{0}\"")));
+                                                throw (new \Exception(str_replace(array("{0}", "{1}"), array($fieldNameAux, implode("|", $arrayFieldDefinition[$fieldName]["defaultValues"])), "Invalid value for \"{0}\", it only accepts values: \"{1}\".")));
                                             }
                                         }
                                     }
@@ -307,7 +307,7 @@ class Process
                 $nameForException = (isset($arrayFieldNameForException[$key]))? $arrayFieldNameForException[$key] : "";
 
                 if (!is_null($value) && ($value . "" == "" || !preg_match("/^(?:\+|\-)?(?:0|[1-9]\d*)$/", $value . "") || (int)($value) < 0)) {
-                    throw (new \Exception(str_replace(array("{0}"), array($nameForException), "Invalid value specified for \"{0}\". Expecting positive integer value")));
+                    throw (new \Exception(str_replace(array("{0}"), array($nameForException), "Invalid value for \"{0}\". Expecting positive integer value.")));
                 }
             }
         } catch (\Exception $e) {
@@ -329,7 +329,7 @@ class Process
             $process = new \Process();
 
             if (!$process->processExists($processUid)) {
-                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $processUid), "The project with {0}: {1} does not exist");
+                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $processUid), "The project with {0}: {1} does not exist.");
 
                 throw (new \Exception($msg));
             }
@@ -352,7 +352,7 @@ class Process
             $user = new \Users();
 
             if (!$user->userExists($userUid)) {
-                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $userUid), "The user with {0}: {1}, does not exist");
+                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $userUid), "The user with {0}: {1}, does not exist.");
 
                 throw (new \Exception($msg));
             }
@@ -397,7 +397,7 @@ class Process
             $obj = \ProcessCategoryPeer::retrieveByPK($processCategoryUid);
 
             if (!(is_object($obj) && get_class($obj) == "ProcessCategory")) {
-                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $processCategoryUid), "The project category with {0}: {1}, does not exist");
+                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $processCategoryUid), "The project category with {0}: {1}, does not exist.");
 
                 throw (new \Exception($msg));
             }
@@ -420,7 +420,7 @@ class Process
             $obj = \AdditionalTablesPeer::retrieveByPK($additionalTableUid);
 
             if (!(is_object($obj) && get_class($obj) == "AdditionalTables")) {
-                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $additionalTableUid), "The PM Table with {0}: {1} does not exist");
+                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $additionalTableUid), "The PM Table with {0}: {1} does not exist.");
 
                 throw (new \Exception($msg));
             }
@@ -454,7 +454,7 @@ class Process
             $rsCriteria = \TaskPeer::doSelectRS($criteria);
 
             if (!$rsCriteria->next()) {
-                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $taskUid), "The activity with {0}: {1} does not exist");
+                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $taskUid), "The activity with {0}: {1} does not exist.");
 
                 throw (new \Exception($msg));
             }
@@ -488,7 +488,7 @@ class Process
             }
 
             if ($flag == 0) {
-                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $fileName), "The routing screen template with {0}: {1} does not exist");
+                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $fileName), "The routing screen template with {0}: {1} does not exist.");
 
                 throw (new \Exception($msg));
             }
diff --git a/workflow/engine/src/ProcessMaker/BusinessModel/Step.php b/workflow/engine/src/ProcessMaker/BusinessModel/Step.php
index 000c83855..be848289a 100644
--- a/workflow/engine/src/ProcessMaker/BusinessModel/Step.php
+++ b/workflow/engine/src/ProcessMaker/BusinessModel/Step.php
@@ -167,9 +167,11 @@ class Step
      */
     public function throwExceptionIfHaveInvalidValueInTypeObj($stepTypeObj)
     {
-        if (!in_array($stepTypeObj, array("DYNAFORM", "INPUT_DOCUMENT", "OUTPUT_DOCUMENT", "EXTERNAL"))) {
+        $arrayDefaultValues = array("DYNAFORM", "INPUT_DOCUMENT", "OUTPUT_DOCUMENT", "EXTERNAL");
+
+        if (!in_array($stepTypeObj, $arrayDefaultValues)) {
             $field = $this->arrayParamException["stepTypeObj"];
-            throw (new \Exception(str_replace(array("{0}"), array($field), "Invalid value specified for \"{0}\"")));
+            throw (new \Exception(str_replace(array("{0}", "{1}"), array($field, implode("|", $arrayDefaultValues)), "Invalid value for \"{0}\", it only accepts values: \"{1}\".")));
         }
     }
 
@@ -182,10 +184,12 @@ class Step
      */
     public function throwExceptionIfHaveInvalidValueInMode($stepMode)
     {
-        if (!in_array($stepMode, array("EDIT", "VIEW"))) {
+        $arrayDefaultValues = array("EDIT", "VIEW");
+
+        if (!in_array($stepMode, $arrayDefaultValues)) {
             $field = $this->arrayParamException["stepMode"];
 
-            throw (new \Exception(str_replace(array("{0}"), array($field), "Invalid value specified for \"{0}\"")));
+            throw (new \Exception(str_replace(array("{0}", "{1}"), array($field, implode("|", $arrayDefaultValues)), "Invalid value for \"{0}\", it only accepts values: \"{1}\".")));
         }
     }
 
@@ -201,10 +205,7 @@ class Step
         $step = new \Step();
 
         if (!$step->StepExists($stepUid)) {
-            $field = $this->arrayParamException["stepUid"];
-
-            $msg = str_replace(array("{0}"), array($field), "Invalid value specified for \"{0}\"") . " / ";
-            $msg = $msg . str_replace(array("{0}", "{1}"), array($stepUid, "STEP"), "The UID \"{0}\" does not exist in table {1}");
+            $msg = str_replace(array("{0}", "{1}"), array($this->arrayParamException["stepUid"], $stepUid), "The step with {0}: {1} does not exist.");
 
             throw (new \Exception($msg));
         }
@@ -222,10 +223,7 @@ class Step
         $task = new \Task();
 
         if (!$task->taskExists($taskUid)) {
-            $field = $this->arrayParamException["taskUid"];
-
-            $msg = str_replace(array("{0}"), array($field), "Invalid value specified for \"{0}\"") . " / ";
-            $msg = $msg . str_replace(array("{0}", "{1}"), array($taskUid, "TASK"), "The UID \"{0}\" does not exist in table {1}");
+            $msg = str_replace(array("{0}", "{1}"), array($this->arrayParamException["taskUid"], $taskUid), "The activity with {0}: {1} does not exist.");
 
             throw (new \Exception($msg));
         }
@@ -243,10 +241,7 @@ class Step
         $process = new \Process();
 
         if (!$process->exists($processUid)) {
-            $field = $this->arrayParamException["processUid"];
-
-            $msg = str_replace(array("{0}"), array($field), "Invalid value specified for \"{0}\"") . " / ";
-            $msg = $msg . str_replace(array("{0}", "{1}"), array($processUid, "PROCESS"), "The UID \"{0}\" does not exist in table {1}");
+            $msg = str_replace(array("{0}", "{1}"), array($this->arrayParamException["processUid"], $processUid), "The project with {0}: {1} does not exist.");
 
             throw (new \Exception($msg));
         }
@@ -274,33 +269,33 @@ class Step
             $this->throwExceptionIfNotExistsProcess($processUid);
 
             if (!isset($arrayData["STEP_TYPE_OBJ"])) {
-                throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepTypeObj"]), "The \"{0}\" attribute is not defined")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepTypeObj"]), "Undefined value for \"{0}\", it is required.")));
             }
 
             $arrayData["STEP_TYPE_OBJ"] = trim($arrayData["STEP_TYPE_OBJ"]);
 
             if ($arrayData["STEP_TYPE_OBJ"] == "") {
-                throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepTypeObj"]), "The \"{0}\" attribute is empty")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepTypeObj"]), "Invalid value for \"{0}\", it can not be empty.")));
             }
 
             if (!isset($arrayData["STEP_UID_OBJ"])) {
-                throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepUidObj"]), "The \"{0}\" attribute is not defined")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepUidObj"]), "Undefined value for \"{0}\", it is required.")));
             }
 
             $arrayData["STEP_UID_OBJ"] = trim($arrayData["STEP_UID_OBJ"]);
 
             if ($arrayData["STEP_UID_OBJ"] == "") {
-                throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepUidObj"]), "The \"{0}\" attribute is empty")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepUidObj"]), "Invalid value for \"{0}\", it can not be empty.")));
             }
 
             if (!isset($arrayData["STEP_MODE"])) {
-                throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepMode"]), "The \"{0}\" attribute is not defined")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepMode"]), "Undefined value for \"{0}\", it is required.")));
             }
 
             $arrayData["STEP_MODE"] = trim($arrayData["STEP_MODE"]);
 
             if ($arrayData["STEP_MODE"] == "") {
-                throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepMode"]), "The \"{0}\" attribute is empty")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepMode"]), "Invalid value for \"{0}\", it can not be empty.")));
             }
 
             $this->throwExceptionIfHaveInvalidValueInTypeObj($arrayData["STEP_TYPE_OBJ"]);
@@ -372,18 +367,18 @@ class Step
 
             //Verify data
             if (isset($arrayData["STEP_TYPE_OBJ"]) && !isset($arrayData["STEP_UID_OBJ"])) {
-                throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepUidObj"]), "The \"{0}\" attribute is not defined")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepUidObj"]), "Undefined value for \"{0}\", it is required.")));
             }
 
             if (!isset($arrayData["STEP_TYPE_OBJ"]) && isset($arrayData["STEP_UID_OBJ"])) {
-                throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepTypeObj"]), "The \"{0}\" attribute is not defined")));
+                throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepTypeObj"]), "Undefined value for \"{0}\", it is required.")));
             }
 
             if (isset($arrayData["STEP_TYPE_OBJ"])) {
                 $arrayData["STEP_TYPE_OBJ"] = trim($arrayData["STEP_TYPE_OBJ"]);
 
                 if ($arrayData["STEP_TYPE_OBJ"] == "") {
-                    throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepTypeObj"]), "The \"{0}\" attribute is empty")));
+                    throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepTypeObj"]), "Invalid value for \"{0}\", it can not be empty.")));
                 }
             }
 
@@ -391,7 +386,7 @@ class Step
                 $arrayData["STEP_UID_OBJ"] = trim($arrayData["STEP_UID_OBJ"]);
 
                 if ($arrayData["STEP_UID_OBJ"] == "") {
-                    throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepUidObj"]), "The \"{0}\" attribute is empty")));
+                    throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepUidObj"]), "Invalid value for \"{0}\", it can not be empty.")));
                 }
             }
 
@@ -399,7 +394,7 @@ class Step
                 $arrayData["STEP_MODE"] = trim($arrayData["STEP_MODE"]);
 
                 if ($arrayData["STEP_MODE"] == "") {
-                    throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepMode"]), "The \"{0}\" attribute is empty")));
+                    throw (new \Exception(str_replace(array("{0}"), array($this->arrayParamException["stepMode"]), "Invalid value for \"{0}\", it can not be empty.")));
                 }
             }
 
@@ -859,7 +854,8 @@ class Step
      *
      * @return void
      */
-    public function moveSteps($pro_uid, $tas_uid, $step_uid, $step_pos) {
+    public function moveSteps($pro_uid, $tas_uid, $step_uid, $step_pos)
+    {
         $this->setFormatFieldNameInUppercase(false);
         $this->setArrayParamException(array("taskUid" => "act_uid"));
         $aSteps = $this->getSteps($tas_uid);
diff --git a/workflow/engine/src/ProcessMaker/BusinessModel/Task.php b/workflow/engine/src/ProcessMaker/BusinessModel/Task.php
index ae507dadb..8734ce721 100644
--- a/workflow/engine/src/ProcessMaker/BusinessModel/Task.php
+++ b/workflow/engine/src/ProcessMaker/BusinessModel/Task.php
@@ -75,10 +75,7 @@ class Task
         $task = new \Task();
 
         if (!$task->taskExists($taskUid)) {
-            $field = $this->arrayParamException["taskUid"];
-
-            $msg = str_replace(array("{0}"), array($field), "Invalid value specified for \"{0}\"") . " / ";
-            $msg = $msg . str_replace(array("{0}", "{1}"), array($taskUid, "TASK"), "The UID \"{0}\" doesn't exist in table {1}");
+            $msg = str_replace(array("{0}", "{1}"), array($this->arrayParamException["taskUid"], $taskUid), "The activity with {0}: {1} does not exist.");
 
             throw (new \Exception($msg));
         }
@@ -2188,3 +2185,4 @@ class Task
         }
     }
 }
+
diff --git a/workflow/engine/src/ProcessMaker/BusinessModel/Trigger.php b/workflow/engine/src/ProcessMaker/BusinessModel/Trigger.php
index 8b1fc7870..e7a3876ed 100644
--- a/workflow/engine/src/ProcessMaker/BusinessModel/Trigger.php
+++ b/workflow/engine/src/ProcessMaker/BusinessModel/Trigger.php
@@ -265,7 +265,7 @@ class Trigger
             $rsCriteria = \TriggersPeer::doSelectRS($criteria);
 
             if (!$rsCriteria->next()) {
-                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $triggerUid), "The trigger with {0}: {1}, does not exist");
+                $msg = str_replace(array("{0}", "{1}"), array($fieldNameForException, $triggerUid), "The trigger with {0}: {1}, does not exist.");
 
                 throw (new \Exception($msg));
             }
diff --git a/workflow/engine/src/ProcessMaker/BusinessModel/TriggerWizard.php b/workflow/engine/src/ProcessMaker/BusinessModel/TriggerWizard.php
index d9428880b..a744d23c5 100644
--- a/workflow/engine/src/ProcessMaker/BusinessModel/TriggerWizard.php
+++ b/workflow/engine/src/ProcessMaker/BusinessModel/TriggerWizard.php
@@ -111,7 +111,7 @@ class TriggerWizard
             $arrayLibrary = $this->library->getRegisteredClasses();
 
             if (!isset($arrayLibrary[$this->libraryGetLibraryName($libraryName)])) {
-                $msg = str_replace(array("{0}", "{1}"), array($libraryFieldNameForException, $libraryName), "The library with {0}: \"{1}\" does not exist");
+                $msg = str_replace(array("{0}", "{1}"), array($libraryFieldNameForException, $libraryName), "The library with {0}: \"{1}\" does not exist.");
 
                 throw (new \Exception($msg));
             }
@@ -138,7 +138,7 @@ class TriggerWizard
             $library = $this->library->getLibraryDefinition($this->libraryGetLibraryName($libraryName));
 
             if (!isset($library->methods[$methodName])) {
-                $msg = str_replace(array("{0}", "{1}"), array($methodFieldNameForException, $methodName), "The function with {0}: \"{1}\" does not exist in the library");
+                $msg = str_replace(array("{0}", "{1}"), array($methodFieldNameForException, $methodName), "The function with {0}: \"{1}\" does not exist in the library.");
 
                 throw (new \Exception($msg));
             }
@@ -231,22 +231,22 @@ class TriggerWizard
 
             if ($nInputParam > 0 || $nOutputParam > 0) {
                 if (!isset($arrayData["TRI_PARAMS"])) {
-                    throw (new \Exception(str_replace(array("{0}"), array($fieldNameForException), "The \"{0}\" attribute is not defined")));
+                    throw (new \Exception(str_replace(array("{0}"), array($fieldNameForException), "Undefined value for \"{0}\", it is required.")));
                 }
 
                 if (!is_array($arrayData["TRI_PARAMS"])) {
-                    throw (new \Exception(str_replace(array("{0}"), array($fieldNameForException), "The \"{0}\" attribute is not array")));
+                    throw (new \Exception(str_replace(array("{0}"), array($fieldNameForException), "Invalid value for \"{0}\", this value must be an array.")));
                 }
 
                 $arrayData["TRI_PARAMS"] = array_change_key_case($arrayData["TRI_PARAMS"], CASE_UPPER);
 
                 if ($nInputParam > 0) {
                     if (!isset($arrayData["TRI_PARAMS"]["INPUT"])) {
-                        throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName($fieldNameForException . ".INPUT")), "The \"{0}\" attribute is not defined")));
+                        throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName($fieldNameForException . ".INPUT")), "Undefined value for \"{0}\", it is required.")));
                     }
 
                     if (!is_array($arrayData["TRI_PARAMS"]["INPUT"])) {
-                        throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName($fieldNameForException . ".INPUT")), "The \"{0}\" attribute is not array")));
+                        throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName($fieldNameForException . ".INPUT")), "Invalid value for \"{0}\", this value must be an array.")));
                     }
 
                     $arrayParamData["input"] = $arrayData["TRI_PARAMS"]["INPUT"];
@@ -254,11 +254,11 @@ class TriggerWizard
 
                 if ($nOutputParam > 0) {
                     if (!isset($arrayData["TRI_PARAMS"]["OUTPUT"])) {
-                        throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName($fieldNameForException . ".OUTPUT")), "The \"{0}\" attribute is not defined")));
+                        throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName($fieldNameForException . ".OUTPUT")), "Undefined value for \"{0}\", it is required.")));
                     }
 
                     if (!is_array($arrayData["TRI_PARAMS"]["OUTPUT"])) {
-                        throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName($fieldNameForException . ".OUTPUT")), "The \"{0}\" attribute is not array")));
+                        throw (new \Exception(str_replace(array("{0}"), array($this->getFieldNameByFormatFieldName($fieldNameForException . ".OUTPUT")), "Invalid value for \"{0}\", this value must be an array.")));
                     }
 
                     $arrayParamData["output"] = $arrayData["TRI_PARAMS"]["OUTPUT"];
diff --git a/workflow/engine/src/ProcessMaker/BusinessModel/Validator.php b/workflow/engine/src/ProcessMaker/BusinessModel/Validator.php
index 93be26c74..b00b2a48b 100644
--- a/workflow/engine/src/ProcessMaker/BusinessModel/Validator.php
+++ b/workflow/engine/src/ProcessMaker/BusinessModel/Validator.php
@@ -344,7 +344,7 @@ class Validator
     {
         try {
             if (!is_array($data)) {
-                $msg = str_replace(array("{0}"), array($dataNameForException), "The data \"{0}\" is not array");
+                $msg = str_replace(array("{0}"), array($dataNameForException), "Invalid value for \"{0}\", this value must be an array.");
 
                 throw (new \Exception($msg));
             }
@@ -365,7 +365,7 @@ class Validator
     {
         try {
             if (empty($data)) {
-                $msg = str_replace(array("{0}"), array($dataNameForException), "The data \"{0}\" is empty");
+                $msg = str_replace(array("{0}"), array($dataNameForException), "Invalid value for \"{0}\", it can not be empty.");
 
                 throw (new \Exception($msg));
             }
diff --git a/workflow/engine/src/Tests/BusinessModel/CalendarTest.php b/workflow/engine/src/Tests/BusinessModel/CalendarTest.php
index 994158d2a..811858039 100644
--- a/workflow/engine/src/Tests/BusinessModel/CalendarTest.php
+++ b/workflow/engine/src/Tests/BusinessModel/CalendarTest.php
@@ -172,7 +172,7 @@ class CalendarTest extends \PHPUnit_Framework_TestCase
      * @covers \ProcessMaker\BusinessModel\Calendar::create
      *
      * @expectedException        Exception
-     * @expectedExceptionMessage The data "$arrayData" is not array
+     * @expectedExceptionMessage Invalid value for "$arrayData", this value must be an array.
      */
     public function testCreateExceptionNoIsArrayData()
     {
@@ -187,7 +187,7 @@ class CalendarTest extends \PHPUnit_Framework_TestCase
      * @covers \ProcessMaker\BusinessModel\Calendar::create
      *
      * @expectedException        Exception
-     * @expectedExceptionMessage The data "$arrayData" is empty
+     * @expectedExceptionMessage Invalid value for "$arrayData", it can not be empty.
      */
     public function testCreateExceptionEmptyData()
     {
@@ -202,7 +202,7 @@ class CalendarTest extends \PHPUnit_Framework_TestCase
      * @covers \ProcessMaker\BusinessModel\Calendar::create
      *
      * @expectedException        Exception
-     * @expectedExceptionMessage The "CAL_NAME" attribute is not defined
+     * @expectedExceptionMessage Undefined value for "CAL_NAME", it is required.
      */
     public function testCreateExceptionRequiredDataCalName()
     {
@@ -222,7 +222,7 @@ class CalendarTest extends \PHPUnit_Framework_TestCase
      * @covers \ProcessMaker\BusinessModel\Calendar::create
      *
      * @expectedException        Exception
-     * @expectedExceptionMessage The "CAL_NAME" attribute is empty
+     * @expectedExceptionMessage Invalid value for "CAL_NAME", it can not be empty.
      */
     public function testCreateExceptionInvalidDataCalName()
     {
@@ -242,7 +242,7 @@ class CalendarTest extends \PHPUnit_Framework_TestCase
      * @covers \ProcessMaker\BusinessModel\Calendar::create
      *
      * @expectedException        Exception
-     * @expectedExceptionMessage Invalid value specified for "CAL_WORK_DAYS"
+     * @expectedExceptionMessage Invalid value for "CAL_WORK_DAYS", it only accepts values: "SUN|MON|TUE|WED|THU|FRI|SAT".
      */
     public function testCreateExceptionInvalidDataCalWorkDays()
     {
@@ -282,7 +282,7 @@ class CalendarTest extends \PHPUnit_Framework_TestCase
      * @covers \ProcessMaker\BusinessModel\Calendar::update
      *
      * @expectedException        Exception
-     * @expectedExceptionMessage The data "$arrayData" is not array
+     * @expectedExceptionMessage Invalid value for "$arrayData", this value must be an array.
      */
     public function testUpdateExceptionNoIsArrayData()
     {
@@ -297,7 +297,7 @@ class CalendarTest extends \PHPUnit_Framework_TestCase
      * @covers \ProcessMaker\BusinessModel\Calendar::update
      *
      * @expectedException        Exception
-     * @expectedExceptionMessage The data "$arrayData" is empty
+     * @expectedExceptionMessage Invalid value for "$arrayData", it can not be empty.
      */
     public function testUpdateExceptionEmptyData()
     {
@@ -312,7 +312,7 @@ class CalendarTest extends \PHPUnit_Framework_TestCase
      * @covers \ProcessMaker\BusinessModel\Calendar::update
      *
      * @expectedException        Exception
-     * @expectedExceptionMessage The calendar with CAL_UID: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx does not exists
+     * @expectedExceptionMessage The calendar with CAL_UID: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx does not exist.
      */
     public function testUpdateExceptionInvalidCalUid()
     {
@@ -335,7 +335,7 @@ class CalendarTest extends \PHPUnit_Framework_TestCase
      * @param   array $arrayRecord Data of the calendars
      *
      * @expectedException        Exception
-     * @expectedExceptionMessage The "CAL_NAME" attribute is empty
+     * @expectedExceptionMessage Invalid value for "CAL_NAME", it can not be empty.
      */
     public function testUpdateExceptionInvalidDataCalName($arrayRecord)
     {
@@ -358,7 +358,7 @@ class CalendarTest extends \PHPUnit_Framework_TestCase
      * @param   array $arrayRecord Data of the calendars
      *
      * @expectedException        Exception
-     * @expectedExceptionMessage Invalid value specified for "CAL_WORK_DAYS"
+     * @expectedExceptionMessage Invalid value for "CAL_WORK_DAYS", it only accepts values: "SUN|MON|TUE|WED|THU|FRI|SAT".
      */
     public function testUpdateExceptionInvalidDataCalWorkDays($arrayRecord)
     {