Could not load file or assembly 'System.Security.Principal.Windows'

Question

Solution has compiled successfully, but after I added an existing class file to the project, this error appeared:

The specified task executable \"csc.exe\

Answer 1

If you are using Microsoft.CodeDom.Providers.DotNetCompilerPlatform you can upgrade to 2.x and then remove Microsoft.Net.Compilers as it's no longer needed. That solved it for me, however I couldn't even build the solution in the first place. It was still complaining about System.Security.Principal.Windows though, I could also solve it by referencing System.Security as an assembly. It's not recommended though.