title: what is the error ? and how can i solve it?
body: <p>I am learning flutter. i have made one app name chat x(title). the code is below</p>
  
  <pre><code>import 'package:flutter/material.dart';
  
  void main() =&gt; runApp(MyApp());
  
  
  class MyApp extends StatelessWidget {
    @override
  Widget build(BuildContext context) {
  return MaterialApp(
    home: Scaffold(
      appBar: AppBar(
        title: Text('Chat X'),
      ),
    body: Card(child: Column(children: &lt;Widget&gt;[
      Text('hey! this one is new');
    ],),),
    ),
  );
   }
   }
  </code></pre>
  
  <p>when ever i want to debug this code i get this error</p>
  
  <blockquote>
    <p>Expected to find ']'.</p>
  </blockquote>