React-Native: Module AppRegistry is not a registered callable module

I'm currently trying to get the ES6 react-native-webpack-server running on an Android emulator. The difference is I've upgraded my package.json and build.grade to use react 0.18.0, and am getting this error on boot. As far as I'm aware AppRegistry is imported correctly. Even if I were to comment out the code this error still comes up. This does work on iOS without issue.

What am I doing wrong?

EDIT: After trying other boilerplates that do support 0.18.0, I'm still coming across the same issue.

i just upgraded to react-native 0.18.1 today tough having some peer dependencies issues with 0.19.0-rc pre-release version.

Back to your question, what I did was

1. cd android
2. sudo ./gradlew clean

then back to the working directory and run react-native run-android

you should restart your npm too after that upgrade.

hope this works for you.

I had the same issue on ios and the cause for me what that my index.io.js was incorrect (because I copy pasted one of the examples without looking at its content), it was ending with a module export declaration

exports.title = ...
exports.description = ...
module.exports = MyRootComponent;

Instead of the expected

AppRegistry.registerComponent('MyAppName', () => MyRootComponent);

You could have the same issue on android with the index.android.js I guess.

Hopefully this can save someone a headache. I got this error after upgrading my react-native version. Confusingly it only appeared on the android side of things.

My file structure includes an index.ios.js and an index.android.js. Both contain the code:

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

What I had to do was, in android/app/src/main/java/com/{projectName}/MainApplication.java, change index to index.android:

@Override protected String getJSMainModuleName() { return "index.android"; // was "index" }

Then in app/build/build.gradle, change the entryFile from index.js to index.android.js

project.ext.react = [ entryFile: "index.android.js" // was index.js" ]

I don't know why, but when I move AppRegistry.registerComponent from the index.js file that is included in index.android.js to reside inside index.android.js directly, it seems to work.

If you are using some of the examples they might not work

Here is my version for scroll view

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 */

import React, {
  AppRegistry,
  Component,
  StyleSheet,
  Text,
  View,
  ScrollView,
  TouchableOpacity,
  Image
} from 'react-native';

class AwesomeProject extends Component {
  render() {
    return (
        <View>
          <ScrollView
            ref={(scrollView) => { _scrollView = scrollView; }}
            automaticallyAdjustContentInsets={false}
            onScroll={() => { console.log('onScroll!'); }}
            scrollEventThrottle={200}
            style={styles.scrollView}>
            {THUMBS.map(createThumbRow)}
          </ScrollView>
          <TouchableOpacity
            style={styles.button}
            onPress={() => { _scrollView.scrollTo({y: 0}); }}>
            <Text>Scroll to top</Text>
          </TouchableOpacity>
        </View>
    );
  }
}

var Thumb = React.createClass({
  shouldComponentUpdate: function(nextProps, nextState) {
    return false;
  },
  render: function() {
    return (
      <View style={styles.button}>
        <Image style={styles.img} source={{uri:this.props.uri}} />
      </View>
    );
  }
});

var THUMBS = [
'http://loremflickr.com/320/240?random='+Math.round(Math.random()*10000) + 1,
'http://loremflickr.com/320/240?random='+Math.round(Math.random()*10000) + 1,
'http://loremflickr.com/320/240?random='+Math.round(Math.random()*10000) + 1
];

THUMBS = THUMBS.concat(THUMBS); // double length of THUMBS
var createThumbRow = (uri, i) => <Thumb key={i} uri={uri} />;

var styles = StyleSheet.create({
  scrollView: {
    backgroundColor: '#6A85B1',
    height: 600,
  },
  horizontalScrollView: {
    height: 120,
  },
  containerPage: {
    height: 50,
    width: 50,
    backgroundColor: '#527FE4',
    padding: 5,
  },
  text: {
    fontSize: 20,
    color: '#888888',
    left: 80,
    top: 20,
    height: 40,
  },
  button: {
    margin: 7,
    padding: 5,
    alignItems: 'center',
    backgroundColor: '#eaeaea',
    borderRadius: 3,
  },
  buttonContents: {
    flexDirection: 'row',
    width: 64,
    height: 64,
  },
  img: {
    width: 321,
    height: 200,
  }
});

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

I uninstalled it on Genymotion. Then run react-native run-android to build the app. And it worked. Do try this first before running sudo ./gradlew clean, it will save you a lot of time.

I solved this issue just by adding

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

to my index.js

make sure this exists in your index.js

The one main reason of this problem could be where you would have installed a plugin and forget to link it.

try this:

react-native link

Re-run your app.

Hope this will help. Please let me know in comments. Thanks.

In my case, my index.js just points to another js instead of my Launcher js mistakenly, which does not contain AppRegistry.registerComponent().

So, make sure the file yourindex.jspoint to register the class.

My issue was fixed by increasing my inotify max_user_watches:

sudo sysctl fs.inotify.max_user_watches=1280000

For me it was a issue with react-native dependency on next version of react package, while in my package.json the old one was specified. Upgrading my react version solved this problem.

For me my issue was putting the wrong entry-file when bundling.

I was using App.js as my entry-file, hence the App couldn't find AppRegistry

Correct:

react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res/

Incorrect:

react-native bundle --platform android --dev false --entry-file App.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res/