Actually this error was often diturbing my user. was solved by removing digital signature and was working good for quite small days. then decided to format the system once and reinstalled the Autocad Mechanical 2012 . After somedays again started pls help me to get out of this issue permanently. THANK YOU:
![Autodesk Design & Make Report](https://forums.autodesk.com/t5/image/serverpage/image-id/1350519iCB55845EBFC43016/image-size/large?v=v2&px=999" "Autodesk Design & Make Report")
