How to resolve VS2010 Windows Form Designer issue (base class could not be loaded)

Question

I have recently been getting an error in the Windows Forms designer of VS2010SP1 when using inherited UserControls.

The error is

The designer

Answer 1

I solved this issue renaming all my forms and user controls and than renaming them back again...

For Example:

My user control...

Right click on..,

Renaming...

And then do the same whit the original name all works now...