I am getting following error in VS2015 when trying to compile a c# project that uses code signing. I didn't get this error in VS2013.
Also there is no information on this error anywhere.
I had this problem. You can open CommonAssemblyInfo.cs and remove the line [assembly: AssemblyKeyFile(@"C:\KeyFile.snk")] :)
I had more or less the same issue with VS 2019 while building a project, but with a .snk file, for a project containing the source code from datalust Superpower that I needed to evaluate and debug:

The CommonAssemblyInfo.cs did not contain any line [assembly: AssemblyKeyFile(@"....snk")]
The solution was to unselect "Sign the assembly" in the properties of the project:

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