I my ASP.NET MVC 4 Project, my Global.asax.cs page shows the error on
WebApiConfig.Register(GlobalConfiguration.Configuration);
Also try doing the opposite (no offense) to what David Bohunek suggests. I tried Davids suggestion to no avail. Then I would up removing that reference that was referenced directly in the "Assemblies" section.
Then I removed the Web Api 2.2 and Web Api 2.2 Web Host Nugets, performed a clean and then JUST added back the Web Api 2.2 Web Host NuGet.
Try that. Good luck, it worked for me.