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

For both of (or all of) the projects that you want to use together:

Right click on the project > Properties > Application > Target .NET framework

Make sure that both of (or all of) your projects are using the same .NET framework version.