title: Main storyboard error in xcode 8 beta
body: <p>I try to build my project in Xcode8 beta, but I get this <code>storyboard</code> error. Also, I cannot open the storyboard. Xcode shows <code>The document "Main.storyboard" could not be opened. Could not verify document content</code> . The error prompts when I try to open.</p>
  
  <blockquote>
    <p>Main.storyboard: Exception while running ibtool: *** -colorSpace not valid for the NSColor NSPatternColorSpace 
  </blockquote>