Detected package downgrade warning (dotnet core, vs 2017)

Question

I have just updated all my nuget packages for my solution (dotnet core 1.1 project).

I am now getting the following warnings and I don\'t really know what they mean.

Answer 1

For me it was caused by referencing a project using a specified version of Microsoft.AspNetCore.App where my project did not :

My project :

referenced project :

Fix (My project) :