类似的问题“未实现的处理丢失的静态目标”和我的情况是完全不同的，因为我的应用程序正在建设，但抛出这个错误。这是我的代码
验证码：

import 'package:flutter/material.dart';
import 'Pages/homepage.dart';

main() => runApp(new HomePage());

验证码：

import 'package:flutter/material.dart';
import 'package:tutorial1/Common%20Classes/UIApplication.dart';

class HomePage extends StatefulWidget {

    @override
  State<StatefulWidget> createState() {
    return new HomePageState();
  }

}

class HomePageState extends State<HomePage>{

UIApplication init = new UIApplication();

@override
  Widget build(BuildContext context) {
    var home = createHomePage();
    return home;
  }

    createHomePage(){
        var homePageScaffold = createHomePageScaffold();
        return MaterialApp(home: homePageScaffold, debugShowCheckedModeBanner: false);
    }

    //Scaffold For Home Page
    createHomePageScaffold(){
      var homeAppbar = homeAppBar();
      var homebody = homeBody();
      var scaffold = new Scaffold(appBar: homeAppbar, body: homebody);
      return scaffold;
    }

    //AppBar For Home Page
    homeAppBar(){
      var text = init.createText('Welcome');
      var appBar = new AppBar(title: text);
      return appBar;
    }

    //Body For Home Page
    homeBody(){
      var text = init.createText("Hello");
      return new Center(child: text);
    }

}

UIApplication.dart Code：

import 'package:flutter/material.dart';

class UIApplication {
    //Create Text
    createText( String text ){
      var newText = new Text(text);
      return newText;
    }
}

虽然我的应用程序正在构建和运行，但它会抛出错误，我知道如果我使用无状态小部件会更简单，但为什么我不能像这样使用有状态小部件呢？这个错误到底意味着什么