title: Xcode : */swiftc failed with exit code 11, what can I do?
body: <p>I downloaded Xcode 7 beta 5, and I tried to compile my project with Xcode 7, and it worked. So, after that, I used Xcode 7 to develop my application, but now, I want to back to Xcode 6 but when I try to build my project, I have this issue :</p>
  
  <pre><code>Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc failed with exit code 11
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/zODHW.png" rel="noreferrer"><img src="https://i.stack.imgur.com/zODHW.png" alt="Screenshot for error"></a></p>
  
  <p>What can I do to resolve that ?</p>