C# Debug - cannot start debugging because the debug target is missing

Question

I am fairly new to C#..

I am using Visual Studio 12, the source I am using was last edited in VS 12.. But my problem is that it\'s throwing me this error:

Answer 1

In my case I had added a project to a solution manually, where that project was targeting a higher .NET version than the rest of the projects that were referencing it. Strange... there would normally be a somewhat more verbose, literal and descriptive error in such cases.

There wasn't a real error but there was a warning that said as much.