System.BadImageFormatException caused by NUnit project

Question

Good day everyone. I have been having the same problem all day at work and am struggling to find any new paths to go down.

I am getting the following error when my

Answer 1

For anyone still having this issue, you also may need to set the framework field on the test runner to match the one in your included project (The field just to the right of the one referenced by AlexM).

In my case, I was writing a test suite for a Windows Phone 8 library, and NUnit was unable to correctly figure out the framework version that it should use.