Unable To Load Image in Flutter

I am new to Flutter. When i tried to load assets, i faced with an issue.

I checked pubspec.yaml file for identiation but i couldn't find any problem.

I checked the given path.

I also tried another images, even extension(.png,.jpg)

This is the Exception:

The following assertion was thrown resolving an image codec:
Unable to load asset: assets/images/pink_flower.jpg

When the exception was thrown, this was the stack: 
#0      PlatformAssetBundle.load (package:flutter/src/services/asset_bundle.dart:225:7)
<asynchronous suspension>
#1      AssetBundleImageProvider._loadAsync (package:flutter/src/painting/image_provider.dart:668:31)
#2      AssetBundleImageProvider.load (package:flutter/src/painting/image_provider.dart:651:14)
#3      ImageProvider.resolveStreamForKey.<anonymous closure> 
(package:flutter/src/painting/image_provider.dart:504:13)
...

This is .yaml file

name: flutterproject
description: VFL Lisesi uygulaması flutter ile.

publish_to: 'none'

version: 1.0.0+1

environment:
sdk: ">=2.7.0 <3.0.0"

dependencies:
flutter:
    sdk: flutter
cupertino_icons: ^1.0.0

dev_dependencies:
flutter_test:
    sdk: flutter
    
flutter:

uses-material-design: true

assets:
    - assets/images/flower2.png
    - assets/images/pink_flower.jpg

fonts:
    - family: Montserrat
    fonts:
        - asset: assets/fonts/montserrat_black.ttf
        weight: 300
        - asset: fonts/montserrat_black_italic.ttf
        weight: 300
        - asset: fonts/montserrat_bold.ttf
        weight: 600
    - family: Trajan Pro
    fonts:
        - asset: fonts/TrajanPro.ttf
        - asset: fonts/TrajanPro_Bold.ttf
        weight: 700

ImageWidget

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

class ImageBanner extends StatelessWidget {

final String _path;

ImageBanner(this._path);

@override
Widget build(BuildContext context) {
    // TODO: implement build
    return Container(
    constraints: BoxConstraints.expand(
        height: 300.0,
    ),
    child: Image.asset(
        _path,
        fit: BoxFit.cover,
    ),
    );
}

}

calling ImageWidget

ImageWidget('assets/images/pink_flower.jpg')

Thanks for any helps!

Whenever you make changes to your pubspec.yaml file, make sure to perform these two steps afterwards.

1. Run flutter pub get.

2. Stop the ongoing session and do a full restart.