Unit Test Adapter threw exception:The given assembly name or codebase was invalid. (Exception from HRESULT: 0x80131047).

I was happily running my SpecFlow tests today and suddenly they all stopped working, and with an unhelpful error message;

Unit Test Adapter threw exception:The given assembly name or codebase was invalid. (Exception from HRESULT: 0x80131047).

Obviously I hadn’t changed anything to cause it right? Well, actually I had added a simple configuration section to my App.Config. I commented that out and it all sprang to life. So if you see that error, read, “I cannot read the config file, please fix it”

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