React-Native: Application has not been registered error

Question

I am currently going through the React-Native tutorials. I began with the Getting Started tutorial, where I made a new react native project and successfully managed to run t

Answer 1

you need to register it in index.android.js / index.ios.js

like this:

'use strict';

import {
    AppRegistry
} from 'react-native';

import app from "./app";

AppRegistry.registerComponent('test', () => app);

Answer 2

This can also be due to Root component name starts with lowercase.

Recorrect it or rather create the project once again with a PascalCase name.

e.g. ignite new HelloWord

Answer 3

First of all you must start your application:

react-native start

Then, you must set your application name as the first argument of registerComponent.

It works fine.

AppRegistry.registerComponent('YourProjectName', () => YourComponentName);

Answer 4

Rather than changing the name in AppRegistry ,

Run react-native init Bananas , this will create react boilerplate code for Bananas project and AppRegistry.registerComponent will automatically point to bananas

AppRegistry.registerComponent('Bananas', () => Bananas);

Answer 5

I had the same problem. I was using Windows for creating a react native app for android and was having the same error. Here's what worked.

• Navigate to the folder ANDROID in your root.
• Create a file with name : local.properties
• Open it in editor and write :

sdk.dir = C:\Users\ USERNAME \AppData\Local\Android\sdk

• Replace USERNAME with the name of your machine.

Save and run the app normally. That worked for me.

Answer 6

The issue will also appear when, in index.js, you have named the app differently from the name you gave it for the android/ios package; probably this happened when you've ejected the app. So be sure that when calling AppRegistry.registerComponent('someappname', () => App), someappname is also used for the native packages or viceversa.