What could be causing a System.TypeLoadException in a Visual Studio Unit Test?

Question

I\'ve got a C# .NET class library MyClassLibrary that compiles fine. I\'m trying to create a unit test project for it (using Visual Studio Unit Testing Fram

Answer 1

The MyClassLibrary assembly was set to x86 mode in the configuration manager. Changing this to x64 fixed it. I really wish Visual Studio would detect this and report it as a less obscure error.