InfoPath Dev

This infopath form is developed using infopath 2007. when i try to access the VSTO from  tools-programming, i get this error Infopath has encounterd an eror , operation failed.  I am able to complile the generated C ## code. Please advise how to fix this issue

I am  able to use access VSTO for other forms.

I think I have seen similar issues before. It could be an InfoPath bug, a possible workaround is to re-insert the code from scratch. The steps are:

1. Open your solution in Designer
2. Remove code (Tools | Form Options, Programming, "Remove Code" button), save as
3. Create a new VSTO solution based on your codeless XSN
4. Copy-paste the code from the old VS solution into FormCode.cs

With luck, it will solve your problem.