Was getting the below error while trying to build a unit test project (framework version 4.5.2) in VS 2012.
Delete the .messages file as suggested in some forums, but that didn’t help.
Just tried building the project by changing the Target Framework to 4.6.
That worked and after that on switching back the target version to 4.5.2 also worked.
Hope it helps..
I was getting the above message while analyzing the code coverage for a Unit Test case written for a Plugin using Microsoft Fakes.
Followed this article
And also deleted the .SUO file (hidden file in the root of the solution) and also restarted the Visual Studio. Re-running the code coverage worked properly this time.
Hope it helps.