Error Rendering control - [A] cannot be cast to [B] in the context LoadNeither

Question

I am working on a composite control and this requires me to open multiple Visual studio IDEs and add the control on pages.

This causes Visual Studio to create multip

Answer 1

Try deleting both folders:

C:\Documents and Settings\Mark\Local Settings\Application Data\Microsoft\VisualStudio\9.0\ProjectAssemlies\j-wxrc_j01    
C:\Documents and Settings\Mark\Local Settings\Application Data\Microsoft\VisualStudio\9.0\ProjectAssemlies\bkqrbe-r01

... and letting visual studio generates what it needs.

That worked for me.