资产中的抖动图像未显示。而不是显示空白

Question

我正在尝试在资产中设置图片，但该图片未显示，除了该图片，我只能看到空白。.有人可以帮我解决这个问题吗？

import 'package:flutter/cupertino.dart';

import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: Scaffold(
            appBar: AppBar(
              title: Text("Image from assets"),
            ),
            body: Container(
                height: 300,
                decoration: BoxDecoration(
                  color: Colors.white,
                  image: DecorationImage(
                    colorFilter: new ColorFilter.mode(Colors.black.withOpacity(0.05), BlendMode.dstATop),
                    image: AssetImage('assets/sample/pexel.jpeg'),
                    fit: BoxFit.cover,
                  ),
                  ))));
          }
}