Toad Data Point Automation Error - DLL file


I have TDP v 4.0 and i have set up an automation to create a report and when i run it, it is always failing at one point and gives the error **"…System.Workflow.Activities.dll could not be opened – File is corrupt". **Ive tried several programs to try and open this file but nothing is working… are there any suggestions on how to fix this error?

I just upgraded to Version 4.2 and now i dont have the issue I described before. [*-)]