FLUTTER Expected a key while parsing a block mapping

FLUTTER Expected a key while parsing a block mapping

ERROR
I used this way for image 

flutter:
  uses-material-design: true
   assets:
     - images/matka.jpg

C:\src\flutter\bin\flutter.bat --no-color packages get
Running "flutter pub get" in flutter_app...                     
Error on line 39, column 10 of pubspec.yaml: Mapping values are not allowed here. 

Did you miss a colon earlier?

   ╷
39 │    assets:
   │          ^
   ╵
Error detected in pubspec.yaml:
Error on line 39, column 10: Mapping values are not allowed here. 

Did you miss a colon earlier?
   ╷
39 │    assets:
   │          ^
   ╵
Please correct the pubspec.yaml file at E:\flutterApps\flutter_app\pubspec.yaml

Process finished with exit code 1

SOLUTIONS:

COrrect way for image 

flutter:
  uses-material-design: true
  assets:
     - images/matka.jpg

The simple fix was to make sure my
 assets section was aligned to my 
uses-material-design section:


Now, when I click on “Get dependencies”,
 all is well. 
Simple issue to fix, but hopefully reading 
this article will save you some time!

SO FINAL CODE FOR IMAGE ASSETS:

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart' show debugPaintSizeEnabled;

void main() {
  //debugPaintSizeEnabled = true; // Remove to suppress visual layout  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter layout demo',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter layout demo'),
        ),
        // Change to buildColumn() for the other column example      

  body: Center(child: buildRow()),
      ),
    );
  }

  Widget buildRow() =>
      // #docregion Row  Row(
    crossAxisAlignment: CrossAxisAlignment.center,
    children: [

      Expanded(
        child: Image.asset('images/matka.jpg'),//matka.jpg is the name of my

 image inserted in Images folder in flutter
      ),
      Expanded(
        flex: 2,
        child: Image.asset('images/matka.jpg'),
      ),

      Expanded(
        child: Image.asset('images/matka.jpg'),
      ),

    ],
  );



  // #enddocregion Row
  Widget buildColumn() =>
      // #docregion Column  Column(
    mainAxisAlignment: MainAxisAlignment.spaceEvenly,
    children: [
      Image.asset('images/matka.jpg'),
      Image.asset('images/matka.jpg'),
    ],
  );
// #enddocregion Column}