Merged in bugfix/HOR-3919 (pull request #6083)

HOR-3919

Approved-by: Paula Quispe <paula.quispe@processmaker.com>
Approved-by: David Callizaya <david.callizaya@processmaker.com>

workflow/engine/src/ProcessMaker/Plugins/PluginRegistry.php

@@ -105,7 +105,7 @@ class PluginRegistry
      */
     public function registerPlugin($Namespace, $Filename = null)
     {
-        $ClassName = $Namespace . "plugin";
+        $ClassName = $Namespace . "Plugin";
         $plugin = new $ClassName($Namespace, $Filename);
 
         if (isset($this->_aPluginDetails[$Namespace])) {