Javascript 不变违例："；trackerApp“；尚未注册

几天以来，我一直在为以下错误而挣扎：

 **Invariant Violation: "trackerApp" has not been registered. This can happen if:
* Metro (the local dev server) is run from the wrong folder. Check if Metro is running, stop it and restart it in the current project.
* A module failed to load due to an error and `AppRegistry.registerComponent` wasn't called.**

我检查了所有的东西，但什么都没用

app.json中的代码

{
  "name": "trackerApp",
  "displayName": "trackerApp"
}

index.js中的代码

import {AppRegistry} from 'react-native';
import App from './App';
// import {name as appName} from './app.json';
import { name as appName } from "./app.json";
// import App from "./src/App.tsx";

// Register the service
AppRegistry.registerComponent(appName, () => App);

尝试清理缓存

cd android

然后

./gradlew clean

再建

如果不起作用，请删除node_modules文件夹并使用

warn install

或

npm install

重新安装软件包

如果仍然无法工作，请检查这些文件是否都有“trackerApp”

1-root/package.json（通常在第2行）

2-root/android/settings.gradle

rootProject.name = 'trackerApp'

3-root/android/app/src/debug/java/com/trackerApp/ReactNativeFlipper.java（在注释下面的第一行代码中）

4-root/android/app/src/main/java/com/trackerApp/ReactNativeFlipper.java

内部函数初始化Flipper检查是否为com.trackerApp.reactiveFlipper

Class aClass=Class.forName（“com.trackerApp.ReactNativeFlipper”）；

rootProject.name = 'trackerApp'

package com.trackerApp;

Class<?> aClass = Class.forName("com.trackerApp.ReactNativeFlipper");