The getter 'instance' isn't defined for the type 'FirebaseMessaging'

Question

The getter 'instance' isn't defined for the type 'FirebaseMessaging'. Try importing the library that defines 'instance', correcting the name to the name of an existing getter, or defining a getter or field named 'instance'.
I am trying to implement this sample code
https://github.com/FirebaseExtended/flutterfire/blob/master/packages/firebase_messaging/firebase_messaging/example/lib/main.dart
But it is showing above mentioned error.
How to fix it?

firebase_messaging: ^7.0.3
import 'package:firebase_messaging/firebase_messaging.dart';

Answer 1

The getter 'instance' is not available on firebase_messaging: ^7.x.x , you will need to upgrade to version 8