The type resolution service may only be called from the main application thread
Visual Studio attempted to access required resources from the wrong thread. This error is displayed when the code used to create the designer has called the type resolution service from a thread other than the main application thread.
To correct this error
If you are developing a designer, call the service from the correct thread.
Otherwise, note the exact text of the error message and contact the component vendor.
See Also
Concepts
Getting Help from Microsoft Support (Visual Studio)