小编bal*_*u k的帖子

我正在上传新的应用程序包以播放控制台，并且在上传后说 Version code 1 has already been used. Try another version code.

我已将 pubspec.yaml 中的版本号从 version number: 1.0.0+1 更改为 2.0.0+1 即使它说的是相同的错误

运行这个

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

void main() async {
   await Firebase.initializeApp();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: ThePage(),
    );
  }
}

class ThePage extends StatelessWidget {
  const ThePage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(          
    );
  }
}

正在提供用于空值的 Null 检查运算符并指出该行Firebase.initializeApp()。我也试过flutter clean了。

以及堆栈跟踪中的错误

E/flutter (31894): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: Null check operator used on a null value
E/flutter (31894): #0      MethodChannel.binaryMessenger
package:flutter/…/services/platform_channel.dart:142
E/flutter (31894): …