title: StoryBoard failed - from xcode 8.3.3 to xcode9 beta2
body: <p>After move my project from 8.3.3 to 9.0 beta2, the storyboard counld not work, it just show the outline of the orignal, and i cant complie it, shows the error below.<br>
  Anyone knows why?</p>
  
  <p><img src="https://i.stack.imgur.com/lDGGj.png" alt="Storyborad only show the outline"></p>
  
  <p><img src="https://i.stack.imgur.com/K1sIr.png" alt="Error info"></p>