title: Cannot integrate Firebase in Flutter - MissingPluginException
body: <p>I/flutter ( 1925): MissingPluginException(No implementation found for method createUserWithEmailAndPassword on channel plugins.flutter.io/firebase_auth)</p>
  <p>I followed every steps in the video of The Net Ninja about Firebase Authentication but I keep getting the same error. Please help!</p>
  <p><a href="https://www.youtube.com/watch?v=4d-gIPGzmK4&amp;list=PL4cUxeGkcC9itfjle0ji1xOZ2cjRGY_WB" rel="nofollow noreferrer">https://www.youtube.com/watch?v=4d-gIPGzmK4&amp;list=PL4cUxeGkcC9itfjle0ji1xOZ2cjRGY_WB</a></p>