I have this app it has two classes it spouses to generate a list of notes:

this is the main class 

` import 'package:flutter/cupertino.dart';

import 'package:flutter/material.dart';

import 'package:notesgenerator/sala.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {

// This widget is the root of your application.

@override

Widget build(BuildContext context) {

List<Sala> locs = [
 
  Sala(note: 'Study', noteDes: 'from 6pm ~ 8pm'),
 
  Sala(note: 'Work', noteDes: 'from 8pm ~ 9pm'),
 
  Sala(note: 'Play', noteDes: 'from 9pm ~ 9:30pm'),
 
  Sala(note: 'Eat', noteDes: 'from 9:30pm ~ 10pm'),
];

return Scaffold(
  appBar: AppBar(
    title: Text('NoteIndex'),
    centerTitle: true,
  ),
  body: ListView.builder(
      itemCount: 10,
      itemBuilder: (context, index) {
        return Card(
          child: ListTile(
            onTap: () {},
            title: (Text(locs[index].note)),
          ),
        );
      }),
);}}

`

this is the class that store the data

class Sala {

String note;

String noteDes;

Sala({this.note, this.noteDes}); }

when I try to run it that is what I get:

I/flutter (21388): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════

I/flutter (21388): The following assertion was thrown building MyApp: I/flutter (21388): MediaQuery.of() called with a context that does not contain a MediaQuery. I/flutter (21388): No MediaQuery ancestor could be found starting from the context that was passed to MediaQuery.of(). I/flutter (21388): This can happen because you do not have a WidgetsApp or MaterialApp widget (those widgets introduce I/flutter (21388): a MediaQuery), or it can happen if the context you use comes from a widget above those widgets. I/flutter (21388): The context used was: I/flutter (21388): Scaffold I/flutter (21388): I/flutter (21388): The relevant error-causing widget was: I/flutter (21388): MyApp file:///F:/FlutterProjects/notesgenerator/lib/main.dart:6:23 I/flutter (21388): I/flutter (21388): When the exception was thrown, this was the stack: I/flutter (21388): #0 MediaQuery.of (package:flutter/src/widgets/media_query.dart:798:5) I/flutter (21388): #1 ScaffoldState.didChangeDependencies (package:flutter/src/material/scaffold.dart:1993:50) I/flutter (21388): #2 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4376:12) I/flutter (21388): #3 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4201:5) I/flutter (21388): #4 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14) I/flutter (21388): #5 Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12) I/flutter (21388): #6 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4243:16) I/flutter (21388): #7 Element.rebuild (package:flutter/src/widgets/framework.dart:3947:5) I/flutter (21388): #8 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4206:5) I/flutter (21388): #9 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4201:5) I/flutter (21388): #10 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14) I/flutter (21388): #11 Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12) I/flutter (21388): #12 RenderObjectToWidgetElement._rebuild (package:flutter/src/widgets/binding.dart:1028:16) I/flutter (21388): #13 RenderObjectToWidgetElement.mount (package:flutter/src/widgets/binding.dart:999:5) I/flutter (21388): #14 RenderObjectToWidgetAdapter.attachToRenderTree. (package:flutter/src/widgets/binding.dart:942:17) I/flutter (21388): #15 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2412:19) I/flutter (21388): #16 RenderObjectToWidgetAdapter.attachToRenderTree (package:flutter/src/widgets/binding.dart:941:13) I/flutter (21388): #17 WidgetsBinding.attachRootWidget (package:flutter/src/widgets/binding.dart:819:7) I/flutter (21388): #18 WidgetsBinding.scheduleAttachRootWidget. (package:flutter/src/widgets/binding.dart:804:7) I/flutter (21388): #27 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:384:19) I/flutter (21388): #28 _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:418:5) I/flutter (21388): #29 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:174:12) I/flutter (21388): (elided 8 frames from package dart:async and package dart:async-patch) I/flutter (21388): I/flutter (21388): ════════════════════════════════════════════════════════════════════════════════════════════════════

if you can help I will really appreciate it

if you have any questions let me know in the comments

I have this application in Flutter. It has two classes it spouses to generate a list of notes.

This is the main class, the MyApp class:

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:notesgenerator/sala.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override

  Widget build(BuildContext context) {

    List<Sala> locs = [
      Sala(note: 'Study', noteDes: 'from 6pm ~ 8pm'),
      Sala(note: 'Work', noteDes: 'from 8pm ~ 9pm'),
      Sala(note: 'Play', noteDes: 'from 9pm ~ 9:30pm'),
      Sala(note: 'Eat', noteDes: 'from 9:30pm ~ 10pm'),
    ];

    return Scaffold(
      appBar: AppBar(
        title: Text('NoteIndex'),
        centerTitle: true,
      ),
      body: ListView.builder(
          itemCount: 10,
          itemBuilder: (context, index) {
            return Card(
              child: ListTile(
                onTap: () {},
                title: (Text(locs[index].note)),
              ),
            );
          }),
    );}}

This is the class that stores the data, the Sala class:

class Sala {
  String note;
  String noteDes;
  Sala({this.note, this.noteDes});
}

When I try to run it, I get this:

I/flutter (21388): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter (21388): The following assertion was thrown building MyApp:
I/flutter (21388): MediaQuery.of() called with a context that does not contain a MediaQuery.
I/flutter (21388): No MediaQuery ancestor could be found starting from the context that was passed to MediaQuery.of().
I/flutter (21388): This can happen because you do not have a WidgetsApp or MaterialApp widget (those widgets introduce
I/flutter (21388): a MediaQuery), or it can happen if the context you use comes from a widget above those widgets.
I/flutter (21388): The context used was:
I/flutter (21388):   Scaffold
I/flutter (21388): 
I/flutter (21388): The relevant error-causing widget was:
I/flutter (21388):   MyApp file:///F:/FlutterProjects/notesgenerator/lib/main.dart:6:23
I/flutter (21388): 
I/flutter (21388): When the exception was thrown, this was the stack:
I/flutter (21388): #0      MediaQuery.of (package:flutter/src/widgets/media_query.dart:798:5)
I/flutter (21388): #1      ScaffoldState.didChangeDependencies (package:flutter/src/material/scaffold.dart:1993:50)
I/flutter (21388): #2      StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4376:12)
I/flutter (21388): #3      ComponentElement.mount (package:flutter/src/widgets/framework.dart:4201:5)
I/flutter (21388): #4      Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14)
I/flutter (21388): #5      Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12)
I/flutter (21388): #6      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4243:16)
I/flutter (21388): #7      Element.rebuild (package:flutter/src/widgets/framework.dart:3947:5)
I/flutter (21388): #8      ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4206:5)
I/flutter (21388): #9      ComponentElement.mount (package:flutter/src/widgets/framework.dart:4201:5)
I/flutter (21388): #10     Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14)
I/flutter (21388): #11     Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12)
I/flutter (21388): #12     RenderObjectToWidgetElement._rebuild (package:flutter/src/widgets/binding.dart:1028:16)
I/flutter (21388): #13     RenderObjectToWidgetElement.mount (package:flutter/src/widgets/binding.dart:999:5)
I/flutter (21388): #14     RenderObjectToWidgetAdapter.attachToRenderTree.<anonymous closure> (package:flutter/src/widgets/binding.dart:942:17)
I/flutter (21388): #15     BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2412:19)
I/flutter (21388): #16     RenderObjectToWidgetAdapter.attachToRenderTree (package:flutter/src/widgets/binding.dart:941:13)
I/flutter (21388): #17     WidgetsBinding.attachRootWidget (package:flutter/src/widgets/binding.dart:819:7)
I/flutter (21388): #18     WidgetsBinding.scheduleAttachRootWidget.<anonymous closure> (package:flutter/src/widgets/binding.dart:804:7)
I/flutter (21388): #27     _Timer._runTimers (dart:isolate-patch/timer_impl.dart:384:19)
I/flutter (21388): #28     _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:418:5)
I/flutter (21388): #29     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:174:12)
I/flutter (21388): (elided 8 frames from package dart:async and package dart:async-patch)
I/flutter (21388): 
I/flutter (21388): ════════════════════════════════════════════════════════════════════════════════════════════════════

If you can help, I will really appreciate it! If you have any questions, please let me know in the comments!