Help with StopWork() and DeleteWork() Script!

Ami_Palombo__(mettra01user1(disabled))

I am a novice with WAPI scripts, but I do not know what I am missing. This script is executed when a WF step is completed and WAPI.StopWork and WAPI.DeleteWork are returning E668794887 via the debugger:Function Dynamic DeleteInvoiceWorkflow( \ Object prgCtx, \ WAPIWORK work, \ Integer workID, \ Integer subWorkID, \ Integer taskID, \ Integer returnSubWorkID, \ Integer returnTaskID, \ Dynamic extraData = Undefined )Integer retValue1Integer retValue2Dynamic retVal Object session = prgCtx.WSession()WAPIWORK workHandle = session.AllocWork()//is returning E668794887retValue1 = WAPI.StopWork(work, workID)retValue2 = WAPI.DeleteWork(work, workID)return (retVal)endAny help would be much appreciated!