FileLoadException when running unit tests in visual studio

Answer 1

If this is the type of error I think it is, it is usually caused by the previously built versions of the assembly files are locked by another process. Try shutting down your other applications and see if it doesn't help. If you do it systematically, you should be able to figure out which one was the culprit.

If that doesn't help, restart Visual Studio.

If that doesn't help either, reboot your computer :)

If that doesn't help either, I'm out of ideas...