Flutter - No MediaQuery Widget Ancestor Found

During the Flutter app development, you may have seen No MediaQuery widget ancestor found. This can happen because you have not added a WidgetsApp, CupertinoApp, or MaterialApp widget (those widgets introduce a MediaQuery), or it can happen if the context you use comes from a widget above those widgets.

Error Massage:

You can see the below error message when occur  No MediaQuery widget ancestor found.

======== Exception caught by widgets library =======================================================
The following assertion was thrown building Scaffold(dirty, state: ScaffoldState#9da29(tickers: tracking 2 tickers)):
No MediaQuery widget ancestor found.

Scaffold widgets require a MediaQuery widget ancestor.
The specific widget that could not find a MediaQuery ancestor was: Scaffold
  dirty
  state: ScaffoldState#9da29(tickers: tracking 2 tickers)
The ownership chain for the affected widget is: "Scaffold ← Home ← [root]"

 

Error Code:

You can see below the code where we are not using any WidgetsApp, CupertinoApp, or MaterialApp. We directly used the Home Stateless widget in runApp.

void main() {
  runApp(const Home());
}

 

class Home extends StatelessWidget {
  const Home({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(body: Card(child: Container()));
  }
}

 

Solution:

We can easily solve this error  MyApp class, you should wrap it with MaterialApp or CupertinoApp. It should fix the problem. You can see below code:

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp( //Wrap MaterialApp Here
      debugShowCheckedModeBanner: false,
      title: 'Errorgram',
      theme: ThemeData(
       // useMaterial3: true,
        primarySwatch: Colors.blue,
      ),
      home: const Home(title: 'Flutter Demo Home Page'),
    );
  }

 

Run your project now your error is fixed.

Conclusion:

We have seen How to solve the error  No MediaQuery widget ancestor found in Flutter. I hope this solution may help you