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Created attachment 3566 [details]
stacktrace of error
The first unit tests that pass cause this error. If all tests fail, the unit tests run.
I've encountered exactly the same problem in Xamarin Studio 4.0.3 when running Pkcs11Interop  tests. These tests run without any problems in GUI application provided by NUnit-18.104.22.16851 but I am not sure whether it uses Mono or .NET runtime.
I've just updated to Xamarin Studio 4.0.5 (build 4) and this problem no longer occurs.
Thanks for letting us know.