title: Visual Studio 2015 Error: "csc.exe" exited with code -1
body: <p>If I try to debug an application in VS2015, I Always get the error</p>
  
  <p><code>"csc.exe" exited with code -1.</code></p>
  
  <p>If I try another project (winforms/console application/...) I always get the same error. I previously had VS2008 installed for developing apps for WIN CE-devices, and I thought that might be the reason, but I already uninstalled VS2008, and reinstalled VS2015 (multiple times).</p>
  
  <p>I have no other ideas what to do, did anyone had the same problem earlier?</p>