title: Unknown class in Interface Builder file. Xcode 6 and Swift
body: <p>I started a vanilla master detail project with swift. If I add a new view controller and set the custom class, then the modules list is empty and it is not possible to choose a module. The error message "Unknown class in Interface Builder file." appears in the console if I run the code. 
  How can I setup the storyboard to know the custom class and module?</p>
  
  <p>How it should be. The two classes from the template are just fine.</p>
  
  <p><img src="https://i.stack.imgur.com/OAnWL.png" alt="How it should be"></p>
  
  <p>and how it is</p>
  
  <p><img src="https://i.stack.imgur.com/1yPkI.png" alt="Missing module"></p>
  
  <p>I have to add <code>customModule="Target_Name" customModuleProvider="target"</code> to the interface builder source code. That is really annoying! <img src="https://i.stack.imgur.com/EQDyJ.png" alt="open .storyboard as source code"></p>
  
  <p>Update:
  If I move the whole project directory to another, e.g. to the desktop it works. Looks like my directory with the name "Repository" is broken. Don't know why :(</p>