I changed my Asp.Net Core 1.1 application to Core 2.0
This went pretty well but after I updated my nuget packages and I get this error everywhere
The type 'xxx' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.
When I press the button to add an assembly nothing happens. I tried rebuilding and restoring my packages multiple times but it won't work