A module failed to load due to an error and `AppRegistry.registerComponent` wasn't called.[ios, xcode]

I have android and ios app in react native which both uses webview to show webpage as application.Since I had to change package name to deploy it on google play since first one package name was occupied. I changed app.json file and all names in android folder and that's ok.

Now my question is what I need to change in my ios folder in order to my app work in xcode. I have this error.

Invariant Violation: "RestApp" has notbeen 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.

This is my app.json file

{"name": "restapphhopp","displayName": "RestApphhopp"}

Index.js file

/** * @format */import {AppRegistry} from 'react-native';import App from './App';import {name as appName} from './app.json';AppRegistry.registerComponent(appName, () => App);