Image Picker Issue Flutter

This is the issue, I'm facing on the image picker

The argument type 'Future<File> (where File is defined in C:\Users\RIDDHI\AndroidStudioProjects\flutter\bin\cache\pkg\sky_engine\lib\io\file.dart)' can't be assigned to the parameter type 'Future<File> (where File is defined in C:\Users\RIDDHI\AndroidStudioProjects\flutter\bin\cache\pkg\sky_engine\lib\html\html_dart2js.dart)'. 

My code where the error is

import 'dart:html'; import 'package:flutter/material.dart'; import 'dart:convert'; import 'package:cloud_firestore/cloud_firestore.dart'; import 'package:admin_app/db/category.dart'; import 'package:admin_app/db/brand.dart'; import 'package:flutter_typeahead/flutter_typeahead.dart'; import 'package:image_picker/image_picker.dart'; import 'package:fluttertoast/fluttertoast.dart'; import 'package:firebase_storage/firebase_storage.dart'; class AddProduct extends StatefulWidget { @override _AddProductState createState() => _AddProductState(); } class _AddProductState extends State<AddProduct> { CategoryService _categoryService = CategoryService(); BrandService _brandService = BrandService(); GlobalKey<FormState> _formKey = GlobalKey<FormState>(); TextEditingController productNameController = TextEditingController(); TextEditingController quatityController = TextEditingController(); List<DocumentSnapshot> brands = <DocumentSnapshot>[]; List<DocumentSnapshot> categories = <DocumentSnapshot>[]; List<DropdownMenuItem<String>> categoriesDropDown = <DropdownMenuItem<String>>[]; List<DropdownMenuItem<String>> brandsDropDown = <DropdownMenuItem<String>>[]; String _currentCategory; String _currentBrand; Color white = Colors.white; Color black = Colors.black; Color grey = Colors.grey; Color red = Colors.red; List<String> selectedSizes = <String>[]; File _image1; File _image2; File _image3; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( elevation: 0.1, backgroundColor: white, leading: Icon(Icons.close, color: black,), title: Text("add product", style: TextStyle(color: black),), ), body: Form( key: _formKey, child: SingleChildScrollView( child: Column( children: <Widget>[ Row( children: <Widget>[ Expanded( child: Padding( padding: const EdgeInsets.all(8.0), child: OutlineButton( borderSide: BorderSide(color: grey.withOpacity(0.5), width: 2.5), onPressed: (){ _selectImage(ImagePicker.pickImage(source: ImageSource.gallery), 1); }, child: _displayChild1() ), ), ), Expanded( child: Padding( padding: const EdgeInsets.all(8.0), child: OutlineButton( borderSide: BorderSide(color: grey.withOpacity(0.5), width: 2.5), onPressed: (){ _selectImage(ImagePicker.pickImage(source: ImageSource.gallery), 2); }, child: _displayChild2() ), ), ), Expanded( child: Padding( padding: const EdgeInsets.all(8.0), child: OutlineButton( borderSide: BorderSide(color: grey.withOpacity(0.5), width: 2.5), onPressed: (){ _selectImage(ImagePicker.pickImage(source: ImageSource.gallery), 3); }, child: _displayChild3(), ), ), ), ], ), void _selectImage(Future<File> pickImage, int imageNumber) async{ File tempImg = await pickImage; switch(imageNumber){ case 1: setState(() => _image1 = tempImg); break; case 2: setState(() => _image2 = tempImg); break; case 3: setState(() => _image3 = tempImg); break; } } Widget _displayChild1() { if(_image1 == null){ return Padding( padding: const EdgeInsets.fromLTRB(14, 70, 14, 70), child: new Icon(Icons.add, color: grey,), ); }else{ return Image.file(_image1, fit: BoxFit.fill, width: double.infinity,); } } Widget _displayChild2() { if(_image2 == null){ return Padding( padding: const EdgeInsets.fromLTRB(14, 70, 14, 70), child: new Icon(Icons.add, color: grey,), ); }else{ return Image.file(_image2, fit: BoxFit.fill, width: double.infinity,); } } Widget _displayChild3() { if(_image3 == null){ return Padding( padding: const EdgeInsets.fromLTRB(14, 70, 14, 70), child: new Icon(Icons.add, color: grey,), ); }else{ return Image.file(_image3, fit: BoxFit.fill, width: double.infinity,); } } 

The error is mainly inline ImagePicker.pickImage(source: ImageSource.gallery)

I have added the image picker in pubspec.yaml, as well as imported 'package:image_picker/image_picker.dart' Please if someone could help in the same. I have read different solutions but none of them worked