面对此问题[core/no-app]未创建Firebase App“[DEFAULT]”-调用Firebase.initializeApp（）
添加后仍然不工作

import 'package:firebase_core/firebase_core.dart';
 import 'package:flutter/material.dart';
 import 'Screens/HomePage.dart';

 Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
   runApp(MyApp());
    }

       class MyApp extends StatelessWidget {
         @override
        Widget build(BuildContext context) {
     return MaterialApp(
        title: "FireBase Database",
     theme: ThemeData(primarySwatch: Colors.red),
         debugShowCheckedModeBanner: false,
        home: HomePage(),
            );
         }
             }