title: NSUnkownkKeyException Xcode
body: <p>Yesterday I added a new class and created a IBOutlet with a label called labelDays.  I then deleted that class now I get this exception.  I think that it is because it is looking for the label but since I deleted the class it can't find it. I am using Xcode 6.</p>
  
  <pre><code>2015-01-09 13:25:25.909 Test App1! [1462:52506] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[&lt;UIViewController 0x7fb08bf32000&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key labelDays.'
  </code></pre>