title: createState mathod is not working in StatefulWidget in flutter.... it shows the following error
body: <p>there createState mehod is not working..</p>
  <pre><code>[class MysignupPage extends StatefulWidget {
    const MysignupPage({ Key key }) : super(key: key);
    @override
    _MysignupPageState createState() =&gt; _MysignupPageState();
  }
  class _MysignupPageState extends StatelessWidget {
    final _auth = FirebaseAuth.instance;][1]
  </code></pre>
  <p>this error is shown
  [1]: <a href="https://i.stack.imgur.com/An0iV.png" rel="nofollow noreferrer">https://i.stack.imgur.com/An0iV.png</a></p>