title: iOS: App doesn't work after a while (parallel installation of Xcode 8)
body: <p>I used XCode 7.3 for a long time and have developed a game for my wife. Today when recompiling and starting it on the iPhone I get an error:</p>
  
  <pre><code>dyld: Library not loaded: @rpath/libswiftAVFoundation.dylib
    Referenced from: /private/var/mobile/Containers/Bundle/Application/797B62E4-4355-4FA7-A56A-90633DF2E16D/Dirks Letter Puzzle.app/Dirks Letter Puzzle
    Reason: no suitable image found.  Did find:
      /private/var/mobile/Containers/Bundle/Application/797B62E4-4355-4FA7-A56A-90633DF2E16D/Dirks Letter Puzzle.app/Frameworks/libswiftAVFoundation.dylib: code signature invalid for '/private/var/mobile/Containers/Bundle/Application/797B62E4-4355-4FA7-A56A-90633DF2E16D/Dirks Letter Puzzle.app/Frameworks/libswiftAVFoundation.dylib'
  </code></pre>
  
  <p>I don't have any idea what it means. It ran fine for month (after updating signing). Meanwhile I installed XCode 8 as a separate App to keep 7.3 for this app. I never changed or updated my little game. So sources are still the same. The iPhone is the same. What happend and how can I get it back to run?</p>