title: Storyboard error unarchiving document objects - *** -[__NSArrayM insertObject:atIndex:]: object cannot be nil
body: <p>My team has a project and we are updating our codes by pushing/pulling it on bitbucket.org. We encountered a problem lately, we cannot open the storyboard of the pulled updated project code. 
  This is what the error said: </p>
  
  <p><code>The document "MainStoryboard.storyboard" could not be opened. The operation couldn’t be completed. (com.apple.InterfaceBuilder error -1.)</code>
  and this is the screen shot</p>
  
  <p><img src="https://i.stack.imgur.com/qbkIO.png" alt="Story Board Error"></p>
  
  <p>Do you have any idea why this happened? What possible wrong move did we do? and do you have any idea how to fix it..? </p>
  
  <p><strong><em>EDIT</em></strong></p>
  
  <p>I have already upgraded to Xcode 4.6.3 but I still get this error.</p>