title: iOS Assertion Failure in UICollectionView
body: <p>I'm getting the error ...</p>
  
  <pre><code>*** Assertion failure in -[UICollectionView _dequeueReusableViewOfKind:withIdentifier:forIndexPath:], /SourceCache/UIKit/UIKit-2372/UICollectionView.m:2249
  </code></pre>
  
  <p>When trying to display a UICollectionView.</p>
  
  <p>The lines causing it are...</p>
  
  <pre><code>static NSString *CellIdentifier = @"Cell";
  
  UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];
  </code></pre>
  
  <p>Error happening on the dequeue.</p>
  
  <p>There are no other errors so I'm struggling to know where to begin with this.</p>
  
  <p>Can anyone shed light on this?</p>