The type initializer for '' threw an exception.

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C#

C#4.0

I had one source code having 25 projects in single solution. It is consisting of both c++ as well as C# project. But now i wanted to call one of C# project(which is of windows application type) calls from a separate test project. I created a separate c# project and added the source reference, and created a object of source code class. it is building fine. but at the time of execution, it is throwing "The type initializer for '' threw an exception" exception. Please give me suggestion to resolve this issue.

Thanks in advance