未处理的异常：在dispose之后调用setState

如何解决未处理的异常：在dispose之后调用setState

我的问题可能是状态管理。 如何设置创建参数？请帮忙！错误可能是什么问题： 未处理的异常：在dispose（）之后调用setState（）

  @override
  Widget build(BuildContext context) {
    return MultiProvider(
      providers: [
        ChangeNotifierProvider.value(
          value: Auth(),),// TO DO: provider that provides an instance of the class Project is not set!!!
        ChangeNotifierProxyProvider<Auth,Projects>(
          //  create : (ctx) => Projects(),update: (ctx,auth,prevIoUsProjects) => Projects(
            auth.token,// auth.userEmail,prevIoUsProjects == null ? [] : prevIoUsProjects.items,],child: Consumer<Auth>(
        builder: (ctx,_) => MaterialApp(
          title: 'IBT',theme: ThemeData(
            primarySwatch: Colors.blue,accentColor: Colors.white,visualDensity: VisualDensity.adaptivePlatformDensity,home: auth.isAuth 
          ? ProjectsOverviewScreen() 
            : AuthScreen(),routes: {
            ProjectsOverviewScreen.id: (ctx) => ProjectsOverviewScreen(),NewProject.routeName: (ctx) => NewProject(),ProjectDetailScreen.routeName: (ctx) => ProjectDetailScreen(),},);
  }
}