title: error: Couldn't materialize struct: Couldn't read eax
body: <p>For debugging on iOS simulator, I used to be able to read out $eax register and get the error message. However, I don't know if it's the new XCode version 4.6 and iOS 6.1, I can't do that any more.</p>
  
  <pre><code>(lldb) po $eax
  error: Couldn't materialize struct: Couldn't read eax (materialize)
  Errored out in Execute, couldn't PrepareToExecuteJITExpression
  </code></pre>
  
  <p>What now?
  Also eax is not in the real device, what do I do?</p>