Why do I get a warning icon when I add a reference to an MEF plugin project?

Question

I wish to test the core class of a plugin by directly referencing the plugin project and instantiating the plugin class. When I create a test Console App project and add a p

Answer 1

Based on the answer from @AljohnYamaro (sorry, couldn't comment on your answer, new account without enough reputation yet, but upvotaded you), I've checked the .csproj file.

On my file, besides the standard project reference:

    true
    true

There were also a directy link to the compiled dll from the referenced project:

    
    ..\ProjectA\bin\Debug\netcoreapp3.1\ProjectA.dll
    

Removing this second reference solved the issue.