You must add a reference to assembly 'netstandard, Version=2.0.0.0

Question

The project is an ASP.NET MVC Web App targeting the .NET Framework 4.6.1.

All of a sudden (some NuGet packages were upgraded) I started to get the following error du

Answer 1

Manually editing the .csproj file and adding the reference below worked for me.

Thank you to Fahad Alshaya who suggested it here.