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Invariant Violation: com.appName has not been registered. This can happen if: – React Native Error. How to fix?

I refactored my android app’s package name that I’d been developing using react native and I ran into this error.

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Invariant Violation: "com.appName" 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.

This happened because I forgot to change the App Name in the app.json which was used by AppRegistry registration.

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

AppRegistry.registerComponent(appName, () => App);
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Hence, I had to fix app.json.

{
  "name": "com.appName",
  "displayName": "NewAppName"
}
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