Visual Studio 2017 bin\roslyn files locked during build

Question

I am running VS2017 version 26430.13 and every time I try to build a web project I get errors that access to the files in the bin\\roslyn is denied. Over a period of about 5 mi

Answer 1

Just open task manager and kill any instances of VBCSCompiler.exe. You don't even need to close Visual Studio.