Provider gives error when calling a widget on the screen - flutter

Question

to make it simple , I'm creating a dashboard where I have a Drawer on the left side of the screen and Another widget that will change based on what the user will choose from Drawer.
Anyway , After adding the onPressed for a menu item , when I press to re-call a new widget next to the drawer I'm getting this error :
Could not find the correct provider<MenuController$> above MainScreen Widget.
So first this is my main.dart :
import 'package:admin/constants.dart';
import 'package:admin/controllers/MenuController.dart';
import 'package:admin/screens/dashboard/dashboard_screen.dart';
import 'package:admin/screens/main/main_screen.dart';
import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:provider/provider.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatefulWidget {
#override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Flutter Admin Panel',
theme: ThemeData.dark().copyWith(
scaffoldBackgroundColor: bgColor,
textTheme: GoogleFonts.poppinsTextTheme(Theme.of(context).textTheme)
.apply(bodyColor: Colors.white),
canvasColor: secondaryColor,
),
home: MultiProvider(
providers: [
ChangeNotifierProvider(
create: (context) => MenuController(),
),
],
child: MainScreen(DashboardScreen()),,
),
);
}
}
and this is my MenuController :
import 'package:flutter/material.dart';
class MenuController extends ChangeNotifier {
final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();
GlobalKey<ScaffoldState> get scaffoldKey => _scaffoldKey;
void controlMenu() {
if (!_scaffoldKey.currentState.isDrawerOpen) {
_scaffoldKey.currentState.openDrawer();
}
}
}
and this is my main_screen :
import 'package:admin/controllers/MenuController.dart';
import 'package:admin/responsive.dart';
import 'package:admin/screens/dashboard/dashboard_screen.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'components/side_menu.dart';
class MainScreen extends StatefulWidget {
Widget newWidget;
MainScreen(this.newWidget);
#override
State<MainScreen> createState() => _MainScreenState();
}
class _MainScreenState extends State<MainScreen> {
#override
Widget build(BuildContext context) {
return Scaffold(
key: context.read<MenuController>().scaffoldKey,
drawer: SideMenu(),
body: SafeArea(
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
// We want this side menu only for large screen
if (Responsive.isDesktop(context))
Expanded(
// default flex = 1
// and it takes 1/6 part of the screen
child: SideMenu(),
),
Expanded(
// It takes 5/6 part of the screen
flex: 5,
child: DashboardScreen(),
),
],
),
),
);
}
}
and finally this is my side_menu :
DrawerListTile(
title: "Fournisseurs",
svgSrc: "assets/icons/menu_tran.svg",
subTitle1: 'Ajouter Un Fournisseur',
subTitle2: 'Liste Des Fournisseurs',
subTitle3: '---------',
press1: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => MainScreen(Text('Hello'))),
);
},
After clicking on this in my Drawer I'm getting the error listed above.

Answer 1

As the error states, the correct provider isn't found above the MainScreen Widget.
See if it helps to structure your main.dart like this:
import 'package:admin/constants.dart';
import 'package:admin/controllers/MenuController.dart';
import 'package:admin/screens/dashboard/dashboard_screen.dart';
import 'package:admin/screens/main/main_screen.dart';
import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:provider/provider.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatefulWidget {
#override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MultiProvider(
providers: [
ChangeNotifierProvider(
create: (context) => MenuController(),
),
],
child: MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Flutter Admin Panel',
theme: ThemeData.dark().copyWith(
scaffoldBackgroundColor: bgColor,
textTheme: GoogleFonts.poppinsTextTheme(Theme.of(context).textTheme)
.apply(bodyColor: Colors.white),
canvasColor: secondaryColor,
),
home: MainScreen(DashboardScreen()),
),
);
}
}