title: fatal error: unexpectedly found nil while unwrapping an Optional value using Dictionary for valid JSON
body: <p>As the title states, I am receiving the "fatal error: unexpectedly found nil while unwrapping an Optional value" error. My JSON is valid, and the link can be found here: <a href="http://www.mocky.io/v2/5844d2801100001d140e6b91" rel="nofollow noreferrer">http://www.mocky.io/v2/5844d2801100001d140e6b91</a> . </p>
  
  <p>The line of code that is giving me an issue is here: </p>
  
  <pre><code>let fighterDetails = dictionary["Fighters"]! as! [[String:AnyObject]]
  </code></pre>
  
  <p>At one point, I had all working code. I went back and re-structed my entire code as I decided to change the topic. I fixed all other errors, but I'm left with this at run-time.</p>
  
  <p><a href="https://i.stack.imgur.com/rlKhh.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rlKhh.png" alt="image"></a>
  <a href="https://i.stack.imgur.com/O6u3P.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/O6u3P.png" alt="json receiver"></a></p>