This gave me the reason to start blogging again – just with the hope that a single developer might get some extra moments doing fun coding instead of analysing this horrible error …. it took me some useless IIS and permission experimenting before stumbling upon this solutijon.
“When you create a new web project, two nuget packages automatically added to your project. If you remove them, your problem should be solved. Package names are: “Microsoft.CodeDom.Providers.DotNetCompilerPlatform” and “Microsoft.Net.Compilers”.