title: vs 2015 Error CS0006 Metadata file .dll' could not be found
body: <p>I am trying to add two new test projects to my solution.  When I add them and add references, the build initially creates the dll's in the debug folder.  when I build or rebuild again, it is always empty and I have a 
  Error   CS0006  Metadata file .dll' could not be found error.  I've checked the build configuration manager and the boxes are checked to have it output to the debug folder. I've tried clean, build, rebuild on the solution, I've made sure there were no other left-over projects laying around and deleted them.  I'm not sure what else I can do to get it to build and output the dll's..</p>