Could not find the correct Provider 报错

使用的是 Provider4.3.2

根据教程在 main 中引入 Provider

void main() {
  //强制竖屏
  WidgetsFlutterBinding.ensureInitialized();
  SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp])
      .then((_) {
    runApp(MultiProvider(
      providers: [
        ChangeNotifierProvider(create: (context) => Counter()),
        ChangeNotifierProvider(create: (context) => CartProvider()),
      ],
      child: MyApp(),
    ));
  });
}

首页是用 PageView 切换四个页面分别是:首页-分类-购物车-我的在首页-分类下使用

final counter = Provider.of<Counter>(context);

会报错 Error: Could not find the correct Provider<Counter> above this CategoryPage Widget

而购物车-我的这两个页面则不会，这两个页面是空白的,尝试吧代码复制给首页-分类都依然报错

Widget build(BuildContext context) {
    final counter = Provider.of<Counter>(context);
    final cart = Provider.of<CartProvider>(context);

    return Scaffold(
      appBar: AppBar(
        elevation: 0, // 隐藏阴影
        title: Text("我的"),
      ),
      body: Center(child: Text("${counter.count}")),
    );
  }