Ok, I have had this one a million times before and it\'s been answered 1 million +1 times before.
And yet, once again. I have 3 projects, A, B, and C, each a DLL. Each
I know this isn't the answer to your issue, but the error is quite similar when you are trying to reference a project with a higher .net version than the one you're using. IE: you can't reference something with .net 4.5 from .net 3.5