diff --git a/workflow/engine/bin/cron_single.php b/workflow/engine/bin/cron_single.php
index cf255305b..21d0dd1a1 100755
--- a/workflow/engine/bin/cron_single.php
+++ b/workflow/engine/bin/cron_single.php
@@ -153,6 +153,7 @@ try {
     G::LoadClass('derivation');
     G::LoadClass('dates'); //Load Criteria
     G::LoadClass('spool');
+    G::LoadClass('pmException');
 
     //Set variables
     /*----------------------------------********---------------------------------*/