title: invalid nib registered for identifier (CELLNAME) - nib must contain exactly one top level object which must be a UITableViewCell instance
body: <p>Sorry for the long title, but I wanted it to be clearly seen from a google search.
  Also, this differs from many of the other similar questions on here as its not specifying a 'null' identifier but one that actually exists.</p>
  
  <p>Essentially the problem occurs when your trying to navigate using one of the cells in a table view controller to segue to another view (Whatever that view may be).</p>
  
  <p>Most people would run into this problem after gunning through the apple tutorial on the 'To-Do List' and expecting the cells to operate in the same motion regardless of their purpose. 
  This problem is probably simplistic to most but for a beginner, its quite hard, it took me around 3 hours. </p>
  
  <p>Basically the error is:</p>
  
  <pre><code>invalid nib registered for identifier (prototypeCell) - nib must contain exactly one top level object which must be a UITableViewCell instance
  </code></pre>
  
  <p>Where 'prototypeCell' would be whatever your cell is called. This is an exception that occurs immediately as the app is launched.</p>