Error while executing Workflow

Hello Experts,

My requirement is Whenever User make any Purchase order above certain amount then mail will go to mail-id provided.

I had made the workflow but when I am trying to execute it following error is showing up in status bar:

Task started under work item ID 864678 (current status: Error)

How should I correct this error?

Also,I am unable to locate What amount variable should I compare in conditions

Please help.

Edited by: shubh_ag on Jul 29, 2011 12:26 PM