I was working today as I do everyday, when I tried to build my project and I got this error:
Encountered multiple versions of the assembly with GUID '00020430-0000-0000-c000-000000000046'. Try pre-importing one of these assemblies.
It says the problem is in the file TlbImp that's in the root directory of my application. The only problem is that I don't have such file in my project and as far as I remember never had.
I am working with a Web Application with Visual Studio 2010 (not sure if this information helps but well, whatever).
There is a Microsoft connect Bug filled for that
It said that there a problem with a reference to an COM component.
This was fixed and should be available in a future release of Visual Studio.
(Note: This did not make it into SP1.)
Tlbimp is the Type Library Importer. Visual Studio use it to generate the interop assembly of references to COM libraries you added.