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如果有人能帮我发现我的颤振应用程序中的错误，我将不胜感激

我认为这是数据库流返回的数据类型的问题

在我的应用程序中，我必须从Firestore的“用户”集合中检索用户信息，以显示在用户配置文件屏幕中，但我遇到以下错误：

======== Exception caught by widgets library =======================================================
The following StateError was thrown building UserProfile(dirty, dependencies: [MediaQuery]):
Bad state: cannot get a field on a DocumentSnapshotPlatform that does not exist

The relevant error-causing widget was: 
  UserProfile file:///Users/JamesMontes/Documents/Flutter-projects/theloudculture/lib/pages/settings/settings_page.dart:30:28
When the exception was thrown, this was the stack: 
#0      DocumentSnapshotPlatform.get (package:cloud_firestore_platform_interface/src/platform_interface/platform_interface_document_snapshot.dart:76:7)
#1      _JsonDocumentSnapshot.get (package:cloud_firestore/src/document_snapshot.dart:92:48)
#2      _JsonDocumentSnapshot.[] (package:cloud_firestore/src/document_snapshot.dart:96:40)
#3      UserProfile.build (package:theloudculture/pages/account/user_profile.dart:31:42)
#4      StatelessElement.build (package:flutter/src/widgets/framework.dart:4569:28)
...
====================================================================================================

======== Exception caught by widgets library =======================================================
Bad state: cannot get a field on a DocumentSnapshotPlatform that does not exist
The relevant error-causing widget was: 
  UserProfile file:///Users/JamesMontes/Documents/Flutter-projects/theloudculture/lib/pages/settings/settings_page.dart:30:28
====================================================================================================

======== Exception caught by widgets library =======================================================
Bad state: cannot get a field on a DocumentSnapshotPlatform that does not exist
The relevant error-causing widget was: 
  UserProfile file:///Users/JamesMontes/Documents/Flutter-projects/theloudculture/lib/pages/settings/settings_page.dart:30:28
====================================================================================================

我的文件包含以下代码：

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:theloudculture/models/user_model.dart';
import 'package:theloudculture/pages/inner_pages.dart';
import 'package:theloudculture/services/database.dart';
import 'package:theloudculture/widgets/widgets.dart';

class Home extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final user = Provider.of<CustomUser>(context);

    return StreamProvider<DocumentSnapshot<Map<String, dynamic>>>.value(
      value: DatabaseService(uid: user != null ? user.uid : null).user,
      child: ChangeNotifierProvider(
        create: (_) => NavegacionModel(),
        child: Container(
          color: Colors.black,
          child: Scaffold(
            backgroundColor: Colors.black,
            appBar: LoudAppBar(),
            body: Paginas(),
            bottomNavigationBar: BottomNavBar(),
          ),
        ),
      ),
    );
  }
}

class NavegacionModel with ChangeNotifier {
  int _paginaActual = 0;
  int get paginaActual => this._paginaActual;

  set paginaActual(int valor) {
    this._paginaActual = valor;

    //Notifying widgets
    notifyListeners();
  }
}

database.dart（在其中检索用户数据）

类数据库服务{
最后一个字符串uid；
数据库服务（{this.uid}）；
//获取用户流
流获取用户{
返回userscolection.doc（uid.snapshots（）；
}
}

提供流的小部件是my Home小部件，具有以下代码：

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:theloudculture/models/user_model.dart';
import 'package:theloudculture/pages/inner_pages.dart';
import 'package:theloudculture/services/database.dart';
import 'package:theloudculture/widgets/widgets.dart';

class Home extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final user = Provider.of<CustomUser>(context);

    return StreamProvider<DocumentSnapshot<Map<String, dynamic>>>.value(
      value: DatabaseService(uid: user != null ? user.uid : null).user,
      child: ChangeNotifierProvider(
        create: (_) => NavegacionModel(),
        child: Container(
          color: Colors.black,
          child: Scaffold(
            backgroundColor: Colors.black,
            appBar: LoudAppBar(),
            body: Paginas(),
            bottomNavigationBar: BottomNavBar(),
          ),
        ),
      ),
    );
  }
}

class NavegacionModel with ChangeNotifier {
  int _paginaActual = 0;
  int get paginaActual => this._paginaActual;

  set paginaActual(int valor) {
    this._paginaActual = valor;

    //Notifying widgets
    notifyListeners();
  }
}

import'包：cloud_firestore/cloud_firestore.dart'；
进口“包装：颤振/材料.省道”；
导入“包：provider/provider.dart”；
导入“包：loudculture/models/user_model.dart”；
导入“package:theloudculture/pages/inner_pages.dart”；
导入“包：loudculture/services/database.dart”；
导入“包：loudculture/widgets/widgets.dart”；
类Home扩展了无状态小部件{
@凌驾
小部件构建（构建上下文）{
最终用户=提供者（上下文）；
返回StreamProvider.value(
值：DatabaseService（uid:user！=null？user.uid:null）。用户，
子项：ChangeNotifierProvider(
创建：（）=>NavegacionModel（），
子：容器(
颜色：颜色，黑色，
孩子：脚手架(
背景颜色：Colors.black，
appBar:LoudAppBar（），
正文：Paginas（），
bottomNavigationBar:BottomNavBar（），
),
),
),
);
}
}
使用ChangeNotifier类NavegacionModel{
int _paginaActual=0；
int get paginaActual=>这个；
设置实际值（int-valor）{
这个。_paginaActual=勇气；
//通知小部件
notifyListeners（）；
}
}

设置页面是home小部件的子项，因此我从该小部件访问用户数据

import 'package:animate_do/animate_do.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:theloudculture/pages/account/user_profile.dart';
import 'package:theloudculture/services/auth.dart';
import 'package:theloudculture/shared/loading.dart';
import 'package:theloudculture/widgets/widgets.dart';

class SettingsPage extends StatelessWidget {
  final AuthService _auth = AuthService();

  @override
  Widget build(BuildContext context) {
    final userData =
        Provider.of<DocumentSnapshot<Map<String, dynamic>>>(context);

    print(userData);

    return userData == null
        ? Loading()
        : FadeIn(
            duration: Duration(milliseconds: 500),
            child: Container(
              padding: EdgeInsets.symmetric(horizontal: 10.0),
              child: Column(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: <Widget>[
                  Expanded(
                    child: UserProfile(userData: userData),
                  ),
                  LargeBtn(
                    btnText: 'Salir',
                    bottomMargin: true,
                    btnAction: () async {
                      await _auth.signOut();
                    },
                  ),
                ],
              ),
            ),
          );
  }
}

import'package:animate_do/animate_do.dart'；
导入“包：cloud_firestore/cloud_firestore.dart”；
进口“包装：颤振/材料.省道”；
导入“包：provider/provider.dart”；
导入“包：loudculture/pages/account/user_profile.dart”；
导入“包：loudculture/services/auth.dart”；
导入“package:theloudculture/shared/loading.dart”；
导入“包：loudculture/widgets/widgets.dart”；
类设置SPAGE扩展了无状态小部件{
最终AuthService_auth=AuthService（）；
@凌驾
小部件构建（构建上下文）{
最终用户数据=
（上下文）的提供者；
打印（用户数据）；
返回userData==null
？加载（）
：法登(
持续时间：持续时间（毫秒：500），
子：容器(
填充：边缘组。对称（水平：10.0），
子：列(
mainAxisAlignment:mainAxisAlignment.spaceBetween，
儿童：[
扩大(
子：UserProfile（userData:userData），
),
大的(
btnText:“Salir”，
是的，
b操作：（）异步{
等待_auth.signOut（）；
},
),
],
),
),
);
}
}

此外，该错误还提到UserProfile小部件，代码如下：

import 'package:flutter/material.dart';
import 'package:theloudculture/pages/account/user_edit_page.dart';
import 'package:theloudculture/pages/account/user_profile_header.dart';
import 'package:theloudculture/shared/loading.dart';
import 'package:theloudculture/widgets/outlined_custom_button.dart';

class UserProfile extends StatelessWidget {
  final userData;

  const UserProfile({
    Key key,
    this.userData,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final screenSize = MediaQuery.of(context).size;

    return userData == null
        ? Loading()
        : Container(
            width: screenSize.width * 0.95,
            height: screenSize.height * 0.7,
            padding: EdgeInsets.only(top: 15.0),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: <Widget>[
                userData == null
                    ? Loading()
                    : UserProfileHeader(
                        userUid: userData['userUid'],
                        userReferrerCode: userData['userReferrerCode'],
                        firstName: userData['firstName'],
                        lastName: userData['lastName'],
                        displayName: userData['displayName'],
                        email: userData['email'],
                        actualProfileImageName: userData['profileImageName'],
                        profileImageUrl: userData['profileImageUrl'],
                      ),
                Container(
                  padding: EdgeInsets.only(top: 15.0),
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: <Widget>[
                      Row(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: <Widget>[
                          Text('Amigos Invitados:'),
                          SizedBox(width: 10.0),
                          Text(userData['invitedFriends'].toString()),
                        ],
                      ),
                      SizedBox(height: 20.0),
                      OutlinedCustomButton(
                        btnText: 'Editar Perfil',
                        btnAction: () {
                          Navigator.push(
                            context,
                            MaterialPageRoute(
                              builder: (context) => UserEditPage(),
                            ),
                          );
                        },
                      ),
                    ],
                  ),
                ),
                Expanded(
                  child: Container(
                    padding:
                        EdgeInsets.symmetric(vertical: 10.0, horizontal: 10.0),
                    child: Center(
                      child: Text(
                        'Aquí van las opciones',
                        style: TextStyle(color: Colors.white),
                      ),
                    ),
                  ),
                )
              ],
            ),
          );
  }
}

导入“包装：颤振/材料.省道”；
导入“package:theloudculture/pages/account/user\u edit\u page.dart”；
导入“package:loudculture/pages/account/user_profile_header.dart”；
导入“package:theloudculture/shared/loading.dart”；
导入“package:loudculture/widgets/outlined_custom_button.dart”；
类UserProfile扩展了无状态小部件{
最终用户数据；
常量用户配置文件({
关键点，
这个.userData，
})：super（key:key）；
@凌驾
小部件构建（构建上下文）{
最终屏幕大小=MediaQuery.of（context）.size；
返回userData==null
？加载（）
：容器(
宽度：screenSize.width*0.95，
高度：屏幕大小。高度*0.7，
填充：仅限边缘设置（顶部：15.0），
子：列(
crossAxisAlignment:crossAxisAlignment.start，
儿童：[
userData==null
？加载（）
：UserProfileHeader(
userUid:userData['userUid']，
userReferrerCode:userData['userReferrerCode']，
firstName:userData['firstName']，
lastName:userData['lastName']，
displayName:userData['displayName']，
电子邮件：userData['email']，
actualProfileImageName:userData['profileImageName']，
profileImageUrl:userData['profileImageUrl']，
),
容器(
填充：仅限边缘设置（顶部：15.0），
子：列(
mainAxisAlignment:mainAxisAlignment.center，
儿童：[
划船(
mainAxisAlignment:mainAxisAlignment.center，
儿童：[
文本（'Amigos Invitados:'），
尺寸箱（宽度：10.0），
文本（userData['invitedFriends'].toString（）），
],
),
尺寸箱（高度：20.0），
大纲自定义按钮(
btnText:'Editar Perfil'，
b国籍：（）{
导航器。推(
上下文
材料路线(
生成器：（上下文）=>UserEditPage（），
    Stream<DocumentSnapshot<Map<String, dynamic>>> get user {
       return usersCollection.doc(uid).snapshots();
    }

    Stream<DocumentSnapshot<Map<String, dynamic>>> get user {
       return FirebaseFirestore.instance.collection('users').where('uid', isEqualTo: uid).snapshots();
    }