flutter：The context used to push or pop routes from the Navigator must be that of a widget that is a

错误：The context used to push or pop routes from the Navigator must be that of a widget that is a descendant of a Navigator widget.
上下文不是Navigator小部件的子级部件导致报错，先查查main文件中是不是少了MaterialApp
state中应该是：

@override
  Widget build(BuildContext context) {
    return MaterialApp(
        navigatorKey: MainAppliaction.getInstance().key,
        title: 'test appBar',
        debugShowCheckedModeBanner: false,
        theme: ThemeData(
            scaffoldBackgroundColor: Colors.transparent
        ),

        home: Guide(),
      )；
  }

大概率问题指向的是这里