Flutter SteamBuilder throwing error on first argument context

I have a problem here with flutter (v2.8.1) on my windows.

I am trying to use StreamBuilder class to fetch data from firebase but it is not working anyhow. I tried to use BuildContext context but it is still throwing me error on context.

Please have a look at my code and let me know what I am doing wrong. Answers are appreciated. Thanks in advance.

StreamBuilder(builder: (BuildContext context, snapshot), stream: _firestore.collection('messages').snapshots()),

Error :

The argument type 'Type' can't be assigned to the parameter type 'Widget Function(BuildContext, AsyncSnapshot<QuerySnapshot<Map<String, dynamic>>>)'.

Please check the image : https://imgur.com/a/QJs6hS9

The builder argument should be a function that returns a widget.

builder: (context, snapshot) {
  // return a widget that uses the snapshot
  // for example
  return Text(snapshot.data().title);
}