Visual Studio Integration Package using WPF results in assembly not found exception

Hi everybody,

I have written a little WPF tool which consumes some LINQ to SQL methods in a separate Assembly. This tool works without any problems.

Now I decided to use this functionality within a Tool Window within Visual Studio by creating a Visual Studio Integration Package for VS2008. However, when I start to debug this project and try to open the Tool window I get the following error message:

Cannot find type 'BusinessObjects.Mask'. The assembly used when compiling might be different than that used when loading and the type is missing.  Error at object 'dbGatewayProvider' in markup file

This is a bit strange, as

- the assembly version is static at 1.0.0.0
- the assembly is within the debug directory

Does anybody have a clue how to solve this problem.

Thanks in advance
Oliver