title: Chromecast VTT not showing
body: <p>I am creating a Chromecast app that streams video and uses out of stream VTT captions. I have successfully managed to load TTML but I require to load VTT also for this I have the following code</p>
  
  <pre><code>this.player.enableCaptions(true, 'vtt', 'http://some_file.vtt');
  </code></pre>
  
  <p>this fails within the MediaPlayer.js with tyhe following error</p>
  
  <pre><code>Uncaught TypeError: Cannot read property 'parse' of null
  </code></pre>
  
  <p>This looks to be in the code to load the individual cues has anyone come across this problem?</p>