title: VS 2013 project in VS 2015: Meta data files missing
body: <p>I just installed VS 2015 and tried to continue work on a project i started in VS 2013. Trying to compile it always throws an error: "Meta data file XYZ not found" File: CSC</p>
  
  <p>How to solve this?</p>
  
  <p>I already cleaned and rebuilt the solution and rebuilt each project on it's own. The only one i couldn't build was the "main" project, which has references to the other projects.</p>