Visual Studio error “Object reference not set to an instance of an object” after install of ASP.NET and Web Tools 2015

Question

After installing the ASP.NET and Web Tools 2015 (RC1 update 1) I get the following error within ASP.NET MVC 4 projects when opening *.cshtml files:

Answer 1

For me,

1. I ended the process in Windows Task Manager: VsHub.exe.
2. Restarted Visual Studio.

After that, everything works like a charm again!