FrankenStein FrankenStein - 3 years ago 996
React JSX Question

undefined is not an object evaluating NativeReactModules.startApp

I just created new react-native app.

tried to build the app and printing "Hello, World" and it worked fine.

and then I installed react-native-navigation, and tried to use it, I registered one screen and


the app is now showing me this error message:

error message


  • React Native Navigation version: 1.1.171

  • React Native version: 0.46.4

  • Platform: Android

  • Device info (Simulator/Device?): Simulator

package com.relay-modern;


import com.facebook.react.ReactApplication;
import com.facebook.react.ReactNativeHost;
import com.facebook.react.ReactPackage;
import com.facebook.soloader.SoLoader;

import java.util.Arrays;
import java.util.List;

public class MainApplication extends Application implements ReactApplication {

private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
public boolean getUseDeveloperSupport() {
return BuildConfig.DEBUG;

protected List<ReactPackage> getPackages() {
return Arrays.<ReactPackage>asList(
new MainReactPackage()

public ReactNativeHost getReactNativeHost() {
return mReactNativeHost;

public void onCreate() {
SoLoader.init(this, /* native exopackage */ false);

Answer Source

Your MainApplication should extends from NavigationApplication.

Please follow the configuration for Android

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