Flutter ไม่รู้เขียนอะไรผิดครับ error

ผมฝีกเขียนตามคลิปนี้ครับแต่ของผมขึ้นerror Image picker camera gallery Flutter, flutter video tutorial in English, part 38 - YouTube

import 'dart:html';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';





void main() {
  runApp(MyApp());
  //runApp(imageTeam());
}


class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
          // is not restarted.
          primarySwatch: Colors.blue,
          ),
      //home: MainPage(),
      home: MainPage(),
    );
  }
}

class MainPage extends StatefulWidget {
  @override
  _MainPageState createState() => _MainPageState();
}

class _MainPageState extends State<MainPage> {
  final title = "basketball";
  File _image;
  final background = "images/basketball_background.jpg";
  final Team_A_Name = "Team Name";
  final Team_B_Name = "Team Name";
  TextEditingController TeamA = TextEditingController(text: "");
  TextEditingController TeamB = TextEditingController(text: "");

  Future getImage() async{
    final image= ImagePicker.pickImage(source: ImageSource.gallery);

    setState(() {
      _image = image as File;
    });
  }



  @override
  Widget build(BuildContext context) {



    return Scaffold(

      body: Builder(
        builder: (context) => Container(
          decoration: BoxDecoration(
            image: DecorationImage(
                image: AssetImage(background),
              fit: BoxFit.cover
            ),
          ),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.start,
            children: <Widget>[
              AppBar(
                toolbarHeight: 70,
                backgroundColor: Colors.black45,
                title: Text(title,style: TextStyle(fontSize: 48,)),
                centerTitle: true,
                titleTextStyle: TextStyle(
                  fontSize: 50,
                  fontWeight: FontWeight.bold,
                ),
              ),
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [

                  Row(
                    mainAxisAlignment: MainAxisAlignment.center,//ProFile
                    children: [

                      Padding(
                            padding: const EdgeInsets.all(10.0),
                            child:
                            CircleAvatar(
                                    radius: 70,
                                    backgroundColor:
                                    Colors.grey[600].withOpacity(0.7),
                              child: ClipOval(
                                child: SizedBox(
                                  width: 180.0,
                                  height: 180.0,
                                  child:_image == null ? Image.file(_image,fit:BoxFit.fill)
                                  
                                  :Image.network('https://firebasestorage.googleapis.com/v0/b/thaidevgroup-89222.appspot.com/o/131897219_434594304234247_5658792147038434898_n.png?alt=media&token=a08a48b2-dcdc-4716-a85a-ca634c2b0c3d',
                                    fit: BoxFit.fill,
                                  ),

                                ),
                              ),

                                  ),
                          ),
                         Padding(
                           padding: EdgeInsets.only(top:70.0),
                           child: IconButton(
                             icon: Icon(
                               Icons.camera_alt,
                               size: 20.0,
                               color: Colors.white,
                             ),
                             onPressed:(){
                               getImage();

                             },
                           ),
                         ),

                         Padding(
                           padding: const EdgeInsets.all(10.0),
                           child: CircleAvatar(
                            radius: 70,
                              backgroundColor:
                              Colors.grey[600].withOpacity(0.7)
                        ),
                         ),


                      ],

                      ),


           ]
          ),

              SizedBox(
                height: 30,
              ),



              Column(                                                           //Team Name
                children: [

                  Padding(
                      padding: const EdgeInsets.only(left:20.0),
                      child: TextField(
                        decoration: InputDecoration(
                          labelText: ("Team A Name"),
                                    labelStyle: TextStyle(fontSize: 24,
                                        color: Colors.red,
                                        fontStyle: FontStyle.normal
                                    ),
                          hintText: "$Team_A_Name",
                          hintStyle: TextStyle(
                            fontFamily: '',
                              fontSize: 24,
                              color: Colors.white,


                          ),
                          border: InputBorder.none,
                        ),
                        maxLines: 1,
                        controller: TeamA,
                        style: TextStyle(
                            fontSize: 24,
                            fontWeight: FontWeight.bold,
                            color: Colors.white
                        ),
                        textInputAction: TextInputAction.done,

                      ),
                     ),


                   Padding(
                      padding: const EdgeInsets.only(left:20.0),
                      child: TextField(
                        decoration: InputDecoration(
                          labelText: ("Team B Name"),
                            labelStyle: TextStyle(fontSize: 24,
                                color: Colors.indigo,
                                fontStyle: FontStyle.normal
                            ),
                          hintText: "$Team_B_Name",
                          hintStyle: TextStyle(
                            fontSize: 24,
                            color: Colors.white,
                          ),
                          border: InputBorder.none,
                        ),
                        maxLines: 1,
                        controller: TeamB,
                        style: TextStyle(
                          fontSize: 24,
                          fontWeight: FontWeight.bold,
                          color: Colors.white,
                         ),
                        textInputAction: TextInputAction.done,
                        ),
                      ),


                ],
              ),

            ],
          ),
        ),
      ),


    );
  }
}

copy error ตรงนั้นมาวางด้วยครับ

มันไม่เชิงว่าerrorครับเหมือนผมเขียนไม่ครบหรืออะไรผิดสักอย่างเหมือนตอนSnackBar ผมแก้ไปนิดหน่อยแล้วครับมันเลยย้ายที่

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