title: UICollectionView Assertion failure
body: <p>I m getting this error on performing <code>insertItemsAtIndexPaths</code> in <code>UICollectionView</code></p>
  
  <p>Assertion failure in: </p>
  
  <pre><code>-[UICollectionViewData indexPathForItemAtGlobalIndex:], 
  /SourceCache/UIKit/UIKit-2372/UICollectionViewData.m:442
  2012-09-26 18:12:34.432  
  *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', 
  reason: 'request for index path for global index 805306367 
  when there are only 1 items in the collection view'
  </code></pre>
  
  <p>I have checked and my datasource contains only one element.
  Any insights on why this could happen? If more information is needed I can definitely provide that.</p>