I had Workflow working in Purchase Order processing last week. Started using it today and when I submit a PO for approval I get the following error below. No changes had been made and this error appears now where last week everything worked:
"[Microsoft][SQL Server Native Client 10.0][SQL Server]A .NET Framework error occurred during execution of user-defined routine or aggregate "SendWorkflowCompletionEmail". System.IO.FileLoadException": Could not load file or assembly 'System.DirectorSer[..." Error gets cut off at the end and I can't find any errors in the Event Viewer.