导航错误后：Scaffold.geometryOf（）在不包含Scaffold的上下文中调用

Question

从登录页面切换到在应用程序中保留底部栏的页面后，我最近收到此错误。换页后，我不明白这里发生了什么。这是我的登录页面：

 Widget loginPage(BuildContext context) {
    return Scaffold(
      resizeToAvoidBottomPadding: false,
      body: Form(
        key: _loginKey,
        child: Container(
          height: MediaQuery.of(context).size.height,
          decoration: BoxDecoration(
            color: Colors.white,
          ),
          child: Column(
  children: <Widget>[
                    Expanded(
                      child: MaterialButton(
                        elevation: 8,
                        shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(30.0),
                        ),
                        color: Colors.teal,
                        onPressed: () {
                          if (validateAndSave()) {
                            FirebaseAuth.instance
                                .signInWithEmailAndPassword(
                                    email: _email, password: _pword)
                                .then((FirebaseUser user) {
                              print('Move To homePage');
                              Navigator.pushReplacement(
                                  context,
                                  MaterialPageRoute(
                                      builder: (BuildContext context) =>
                                          BottomAppBar()));

                              return user;
                            }).catchError((e) {
                              print(e);
                              print('Somethings wrong');
                              // return user;
                            });
                            print('Sign In With');
                          }
                        },

登录后，用户将被转到该页面，在该页面的底部有一个栏，允许他们在页面之间切换。

@override
  Widget build(BuildContext context) {
    return MaterialApp(
   home: _buildBottom(context)
    );
  }


  Widget _buildBottom(BuildContext context){
    return Scaffold(
           key: _scaffoldKey,
        bottomNavigationBar: BubbleBottomBar(
          opacity: .2,
          currentIndex: _currentIndex,
          onTap: _onTabTapped,
          borderRadius: BorderRadius.vertical(top: Radius.circular(14)),
          elevation: 8,
          hasInk: true,
          inkColor: Colors.black12,
          items: [
            BubbleBottomBarItem(
                backgroundColor: Colors.teal,
                icon: Icon(
                  FontAwesomeIcons.personBooth,
                  color: Colors.black,
                ),
                activeIcon: Icon(
                  FontAwesomeIcons.personBooth,
                  color: Colors.teal,
                ),
                title: Text("Nearest",),),
            BubbleBottomBarItem(
                backgroundColor: Colors.teal,
                icon: Icon(
                  FontAwesomeIcons.userCircle,
                  color: Colors.black,
                ),
                activeIcon: Icon(
                  FontAwesomeIcons.userCircle,
                  color: Colors.teal,
                ),
                title: Text("Logs")),
            BubbleBottomBarItem(
                backgroundColor: Colors.teal,
                icon: Icon(
                  Icons.folder_open,
                  color: Colors.black,
                ),
                activeIcon: Icon(
                  Icons.folder_open,
                  color: Colors.teal,
                ),
                title: Text("Folders")),
            BubbleBottomBarItem(
                backgroundColor: Colors.teal,
                icon: Icon(
                  Icons.menu,
                  color: Colors.black,
                ),
                activeIcon: Icon(
                  Icons.menu,
                  color: Colors.teal,
                ),
                title: Text("Menu"))
          ],
        ),
        body: Builder(builder: (context) => pages[_currentIndex]));
      
  }
}

我已经添加了脚手架，但是，不明白这里出了什么问题。