Camera and Gesture (Error)

 Main.dart

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Camera and Gesture',
      theme: ThemeData(primaryColor: Colors.red),
      home: MyHomePage(),
    );
  }
}

HomePage.dart

Error on // File _image;

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

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  File _image;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('My Camera App'),
      ),
      body: Center(
        child: _image == null ? Text('No Image') : Image.file(_image),
      ),
      floatingActionButton: FloatingActionButton(onPressed: _optionsDialogBox, child: Icon(Icons.add_a_photo), tooltip: 'Open Camera'),
    );
  }

  Future<void> _optionsDialogBox() {
    return showDialog(
        context: context,
        builder: (BuildContext context) {
          return AlertDialog(
            backgroundColor: Colors.orange,
            shape: StadiumBorder(),
            content: SingleChildScrollView(
              child: ListBody(
                children: <Widget>[
                  GestureDetector(
                    child: Text(
                      'Take a Picture',
                      style: TextStyle(
                        color: Colors.white,
                        fontSize: 20.0,
                      ),
                    ),
                    onTap: openCamera,
                  ),
                  Padding(
                    padding: EdgeInsets.all(10.0),
                  ),
                  GestureDetector(
                    child: Text(
                      'Select an Image from Gallery',
                      style: TextStyle(
                        color: Colors.white,
                        fontSize: 20.0,
                      ),
                    ),
                    onTap: openGallery,
                  ),
                ],
              ),
            ),
          );
        });
  }

  Future openCamera() async {
    var image = await ImagePicker().pickImage(source: ImageSource.camera);

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

  Future openGallery() async {
    var picture = await ImagePicker().pickImage(source: ImageSource.gallery);

    setState(() {
      _image = picture;
    });
  }
}

iosPermission

<key>NSPhotoLibraryUsageDescription</key>

<string>This app requires access to the photo library.</string>

<key>NSMicrophoneUsageDescription</key>

<string>This app requires access to the microphone</string>

<key>NSCameraUsageDescription</key>

<string>This app requires access to the camera.</string>


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