title: Authentication libraries for flutter
body: <p>I’m trying to use the following packages and the app keeps crashing</p>
  <p>The libraries are :</p>
  <ol>
  <li><p>Fire base auth</p>
  <p><a href="https://github.com/flutter/plugins/tree/master/packages/firebase_auth" rel="nofollow noreferrer">https://github.com/flutter/plugins/tree/master/packages/firebase_auth</a></p>
  </li>
  <li><p>Google sign in</p>
  </li>
  <li><p>Local auth</p>
  </li>
  </ol>