小编Son*_*pta的帖子

请找到以下代码 main.dart：

class MyHomePage extends StatelessWidget {
   MyHomePage({Key key, this.title}) : super(key: key); 
   final String title; 

   @override 
   Widget build(BuildContext context) {
      return Scaffold( 
         appBar: AppBar( title: Text(this.title), ), 
         body: Center( child: Image.asset("assets/smiley.png")),
      ); 
   }
}

pubspec.yaml

name: product_app
description: A new Flutter project.

version: 1.0.0+1

environment:
  sdk: ">=2.1.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^0.1.2

dev_dependencies:
  flutter_test:
    sdk: flutter

flutter:

  uses-material-design: true

  assets:
    - assets/appimages/floppy.png
    - assets/appimages/iphone.png
    - assets/appimages/laptop.png
    - assets/appimages/pendrive.png
    - assets/appimages/pixel.png
    - assets/appimages/tablet.png

执行前；pubspec.yaml 中的资产assets/appimage/test.png 不存在警告执行以下代码后异常来了

??? EXCEPTION …