The type or namespace name 'Mvc' does not exist

The source of your error may be that you do not have a reference to the MVC framework library. A simple solution is to add this reference trough Nuget. The MVC library will be installed in your bin directory and, if needed, all the references will be added to your project.

Either browse for the MVC package (Tools -> Nuget Package Manager -> Manage Nuget Packages for Solution) or install it using the Nuget console (Tools -> Nuget Package Manager -> Package Manager Console) by entering Install-Package Microsoft.AspNet.Mvc. You can find additional information on the official Nuget page for AspNet.Mvc.

My solution was to simply open up the nuget package manager console and run the command update-package -reinstall Microsoft.AspNet.Mvc