Project builds but can't publish

So I made it work.

The problem was the version of the "Microsoft.Net.Compilers". I downgraded from v2.6.1 to v2.4.0.

I don't know why so if someone knows it would be cool to know.

Sorry for reopening the thread, but for me Cleaning the solution worked on .NET.Compilers v2.7 (Visual Studio 2015).