I installed Visual Studio 2015 and rebooted. The \"MVC\" types are not recognized in 2015 but are still recognized in 2013. This is my \"Views\" web.config:
It didn't work for me. It seems that this issue has several root causes related to web.config.
One another problem was root web.config compilation version mismatch.
If httpruntime version is different from the assembly's this may happen.