title: Why am I getting ibtool failed with exit code 255?
body: <p>All of a sudden I can't build my project. I get the following compiler error:</p>
  
  <blockquote>
    <p>/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/ibtool failed with exit code 255</p>
  </blockquote>
  
  <p>I get this error for a whole bunch of my xib files. Any ideas what is happening, and what a solution is?</p>
  
  <p>Using Xcode 4.6, iOS 6.1.</p>