我正在构建一个Flutter应用程序，并且已经集成了Firebase，但当我单击注册、登录或注销按钮时，总是会出现此错误。我看到其他人也问过同样的问题，但似乎没有一个对我有效。我正在使用Flutter和安卓工作室。如何解决此问题？

这是我代码的摘录

类HomeScreen扩展StatefulWidget{@覆盖_主页屏幕状态createState（）=>主页屏幕状态（）；}类_HomeScreenState扩展状态{@覆盖小工具构建（BuildContext上下文）{返回脚手架(背景颜色：颜色。红色，主体：中心(child:容器(子项：RaisedButton(按下：（）{FirebaseAuth.instance.signOut（）.then（（值）{导航器.pushReplacement(上下文，材料页面路径(构建器：（上下文）=>登录屏幕（））；});},child:文本（“注销”），))));}}

下面是引发的异常

══╡ GESTURE引起的异常╞═══════════════════════════════════════════════════════════════════处理手势时引发了以下FirebaseException：[core/no-app]未创建任何Firebase应用程序“[DEFAULT]”-调用Firebase.initializeApp（）引发异常时，这是堆栈：#0 MethodChannelFirebase.app（包：firebase_core_platform_interface/src/method_channel/method_cchannel_firebase.dart:118:5）#1 Firebase.app（包：Firebase_core/src/Firebase.dart:52:41）#2 FirebaseAuth.instance（包：firebase_auth/src/firebase_auth.dart:37:47）#3_主页屏幕状态.build<匿名关闭>（套餐：cosytok/screenses/home.dart:20:28）#4 _确认响应状态_handleTap（包装：flutter/src/material/ink_well.dart:992:19）#5_InkResponseState.build链接响应状态<匿名关闭>（包：flutter/src/material/ink_well.dart:1098:38）#6 GestureRecognizer.invokeCallback（软件包：flutter/src/skets/recognizer.dart:184:24）#7 TapGestureRecognizer.handleTapUp（软件包：flutter/src/skets/tap.dart:524:11）#8个BaseTapGestureRecognizer_checkUp（软件包：flutter/src/skets/tap.dart:284:5）#9 BaseTapGestureRecognizer.handlePrimaryPointer（软件包：flutter/src/skets/tap.dart:219:7）#10 PrimaryPointerGestureRecognizer.handleEvent（软件包：flutter/src/skets/recognizer.dart:477:9）#11指针路由器_分派（package:flutter/src/skets/pointer_router.dart:78:12）#12点路由器_将事件发送到路线<匿名闭包>（package:flutter/src/skets/pointerrouter.dart:124:9）#13_LinkedHashMapMixin.forEach（dart:collection-patch/compact_hash.dart:377:8）#14指针路由器_dispatchEventToRoutes（软件包：flutter/src/gets/pointer_router.dart:122:18）#15 PointerRouter.route（软件包：flutter/src/posites/pointer_router.dart:108:7）#16 GestureBinding.handleEvent（软件包：flutter/src/skets/binding.dart:220:19）#17 GestureBinding.dispatchEvent（软件包：flutter/src/skets/binding.dart:200:22）#18手势绑定_handlePointerEvent（package:flutter/src/skets/binding.dart:158:7）#19手势绑定_flushPointerEventQueue（包：flutter/src/gets/binding.dart:104:7）#20手势装订_handlePointerDataPacket（包：flutter/src/skets/binding.dart:88:7）#24_invoke1（省道：ui/hooks.省道：267:10）#25 _发送指针数据包（dart:ui/hooks.dart:176:5）（省去了dart中的3帧：异步）处理程序：“onTap”识别器：点击手势识别器#f0104════════════════════════════════════════════════════════════════════════════════════════════════════════════ 手势捕捉到异常═══════════════════════════════════════════════════════════════处理手势时引发了以下FirebaseException：[core/no-app]未创建任何Firebase应用程序“[DEFAULT]”-调用Firebase.initializeApp（）