Visual Studio cannot resolve model, but Razor pages loads

Question

I have an MVC 5 application, made from the empty template. I\'ve added Microsoft.AspNet.Mvc via Nuget and my packages file looks like so:

Answer 1

Closing ALL instances of Visual Studio worked for you, great.

I get this symptom periodically, but I am using Resharper, and to fix it I have to

• go into Resharper-Options "Clear Caches",
• and then close and reopen Visual Studio