"Could not determine the type on the left side of the dot"
Dave Donaldson inadvertently demonstrated this VS.NET error message last night while giving a demo of VSTS.
How, you ask? In his own words:
Keep in mind that “Generate Method Stub“ can only be used on methods; it cannot be used to generate classes. If you try to generate a class from a unit test using “Generate Method Stub“, you get this hilarious error: “Could not determine the type on the left side of the dot“.