title: (null) libc++abi.dylib: terminate called throwing an exception
body: <p>I use Xcode 4.5PR and iOS 6beta 2.</p>
  
  <p>I didn't change any codes, my application throw an exception mentioned in the Title.</p>
  
  <p>I used Debug Window which function caused this exception, but it showing</p>
  
  <pre><code>0x38dda960:  push   {r4, r5, r6, r7, lr}
  </code></pre>
  
  <p>How can I find a problem? How can I fix it?</p>