visual studio - Cannot unregister type library xxx - cannot load file, check to make sure it's a valid type library -

After editing the first working solution, Visual Studio 2010 will no longer compile the project and give me the following error:

< P> / P>

The type library can not unregister {library name} - to ensure that the file can not be loaded, check that it is a valid type of library.

I was very little valuable to the web on search but to be found on this error, what can I do to resolve this error?

I do not know what the cause of the error is, but it turns out the solution was very simple - just Close all instances of Visual Studio and then reopen your solution.