Native module RNFirebaseModule tried to override RNFirebaseModule for module name RNFirebase

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React Native has been a non-stop whirlwind of obscure error messages. For example:

Fatal Exception: java.lang.IllegalStateException: Native module RNFirebaseModule tried to override RNFirebaseModule for module name RNFirebase. If this was your intention, set canOverrideExistingModule=true
at com.facebook.react.NativeModuleRegistryBuilder.addNativeModule(NativeModuleRegistryBuilder.java:121)
at com.facebook.react.NativeModuleRegistryBuilder.processPackage(NativeModuleRegistryBuilder.java:109)
at com.facebook.react.ReactInstanceManager.processPackage(ReactInstanceManager.java:1050)
at com.facebook.react.ReactInstanceManager.processPackages(ReactInstanceManager.java:1021)
at com.facebook.react.ReactInstanceManager.createReactContext(ReactInstanceManager.java:959)
at com.facebook.react.ReactInstanceManager.access$600(ReactInstanceManager.java:109)
       at com.facebook.react.ReactInstanceManager$4.run(ReactInstanceManager.java:802)
at java.lang.Thread.run(Thread.java:818)

This one was caused by inadvertantly including the module twice in android/app/src/main/java/com/example/MainApplication.java.

I had included RNFirebasePackage() twice:

@Override
protected List<ReactPackage> getPackages() {
  return Arrays.<ReactPackage>asList(
    new MainReactPackage(),
    new RNFirebasePackage(),
    new VectorIconsPackage(),
    new AndroidWifiPackage(),
    new RNFirebasePackage(),
    new RNFirebaseAuthPackage()
  );
}

HT to the github issue that helped me work out the problem.

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