Visual Studio 2017 - Could not load file or assembly 'System.Runtime, Version=4.1.0.0' or one of its dependencies

Question

I am using Visual Studio 2017 and am trying to create a .Net Standard 1.5 library and use it in a .Net 4.6.2 nUnit test project.

I am getting the following error...

Answer 1

I'm using ASP.Net CORE 2.1 and I got this error when I ran by selecting a .csproj from a list of about 40 in a big repo. When I opened the csproj file individually, the error was resolved. Something with how the program was launched was different when the csproj was opened.