title: Visual Studio 2013 Can't save, build, or rebuild solution
body: <p>Suddenly after i clicked clean solution i am no longer able either to save, build or do anything to the solution. It appears to be a bug as every time i hit CTRL+S or just Rebuild or Build or even Start button i get this message</p>
  
  <p><img src="https://i.stack.imgur.com/l7yth.png" alt="enter image description here"></p>
  
  <ul>
  <li>Also i double checked all the assemblies and they are there nothing
  is missing. I need to find a solution without losing my unsaved data.</li>
  </ul>