Invariant Violation: "myAppName" has not been registered

Description

i'm trying to running on ios emulator, but without success:

Invariant Violation: "myAppName" 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., js engine: hermes

metro is started, and build, so i think the problem is:

A module failed to load due to an error and AppRegistry.registerComponent wasn't called., js engine: hermes

Version

0.70.2

Output of `npx react-native info`

System:
OS: macOS 12.6
CPU: (8) arm64 Apple M1 Pro
Memory: 316.59 MB / 32.00 GB
Shell: 5.8.1 - /bin/zsh
Binaries:
Node: 16.17.1 - /usr/local/bin/node
Yarn: Not Found
npm: 8.15.0 - /usr/local/bin/npm
Watchman: 2022.07.04.00 - /opt/homebrew/bin/watchman
Managers:
CocoaPods: 1.11.3 - /Users/mantegnous/.rvm/gems/ruby-2.7.5/bin/pod
SDKs:
iOS SDK:
Platforms: DriverKit 21.4, iOS 16.0, macOS 12.3, tvOS 16.0, watchOS 9.0
Android SDK: Not Found
IDEs:
Android Studio: 2021.3 AI-213.7172.25.2113.9014738
Xcode: 14.0.1/14A400 - /usr/bin/xcodebuild
Languages:
Java: 11.0.11 - /usr/bin/javac
npmPackages:
@react-native-community/cli: Not Found
react: ^18.2.0 => 18.2.0
react-native: ^0.70.2 => 0.70.2
react-native-macos: Not Found
npmGlobalPackages:
react-native: Not Found

Steps to reproduce

i'm running ios

Snack, code example, screenshot, or link to a repository

I am getting the same error after upgrading to react native 0.71.4

same here

Check the info before the error; that should tell you what's causing it. For me, it was react-native-reanimated.

 Error: Exception in HostFunction: java.lang.NoSuchMethodError: no non-static method "Lcom/swmansion/reanimated/NativeProxy;.registerEventHandler(Lcom/swmansion/reanimated/nativeProxy/EventHandler;)V", js engine: hermes
 LOG  Running "AwesomeProject" with {"rootTag":11}
 ERROR  Invariant Violation: "AwesomeProject" 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., js engine: hermes

i got the same issue any solution yet?

solved the issue by updating all the packages.

@ErickJ3

I getting the same issue except my issue doesn't appear to be related to the js engine: hermes. @ErickJ3 solution did not work for me. I'm running 0.71.4 and testing and iOS app.

Check the App name in MainActivity at getMainComponentName function, app.json, and package.json it will same in these 3 places.

Check the App name in MainActivity at getMainComponentName function, app.json, and package.json it will same in these 3 places.

These all match but still experiencing the issue

A module failed to load due to an error and AppRegistry.registerComponent wasn't called., js engine: hermes
Error: Exception in HostFunction: java.lang.NoSuchMethodError: no non-static method "Lcom/swmansion/reanimated/NativeProxy;.registerEventHandler(Lcom/swmansion/reanimated/nativeProxy/EventHandler;)V", js engine: hermes
LOG Running "naviRn" with {"rootTag":11}
i am also getting this error now even I am running this app from the folder it should we run

Check the App name in MainActivity at getMainComponentName function, app.json, and package.json it will same in these 3 places.

@methineeinkan After using the Upgrade Helper to go to 0.71.6, I had the wrong moduleName in my AppDelegate.mm file. Thanks!

Maybe it's trivial, but make sure your app.config.js or app.json contains "expo" property in the JSON/JS object. In my case it was missing and produced an error "ReferenceError: Property 'TextEncoder' doesn't exist, js engine: hermes" and A module failed to load due to an error and AppRegistry.registerComponent wasn't called., js engine: hermes. I took the config example from somewhere where it wasn't defined.
So keep: {"expo": {"name": "xxx", ...}}

I'm getting the same error, anyone have any solution?

I got the same error in mac for ios and solved it by running
$ cd ios
$ pod install
$ cd ..
and then started the metro by cleaning cache using following command
$ npm start --reset-cache

Check the App name in MainActivity at getMainComponentName function, app.json, and package.json it will same in these 3 places.

it's fo funny, I change name in app.json, it's not working. I don know that it's must same in these 3 places.

any solution? I got the same error runing on android

I got the same error, check the name os app in 3 files a the same.

Check the App name in MainActivity at getMainComponentName function, app.json, and package.json it will same in these 3 places.

These all match but still experiencing the issue

did you fix it? experiencing the same error with hermes

I fix the problem by cold boot the avd

Could this be because the module fails to load and hence AppRegistry.registerComponent doesn't end up getting called?

Check the App name in MainActivity at getMainComponentName function, app.json, and package.json it will same in these 3 places.

thank you, saved my life :D

same problem to run ios with react native 0.74. Same name in app.json, package.json and getMainComponentName. Any solution?

same problem on 0.74

Same problem on 0.73.8

same problem to run ios with react native 0.74. Same name in app.json, package.json and getMainComponentName. Any solution?

Were you able to resolve? Is it due to react-native-navigation (https://github.com/wix/react-native-navigation) package?

+1
facing same problem on 0.74.0

+1
facing same problem on "react-native": "0.74.5",

Hi
I am also facing the same issue though I have placed same name in the three places.

package.json
app.json
MainApplication.kt

Check the App name in MainActivity at getMainComponentName function, app.json, and package.json it will same in these 3 places.

Yeah man it worked for me!!!

Check the App name in MainActivity at getMainComponentName function, app.json, and package.json it will same in these 3 places.

it's fo funny, I change name in app.json, it's not working. I don know that it's must same in these 3 places.

Probably this was causing error, I changed back name in app.json and its working fine now

I solved this problem by changing name to required in AppRegistry.registerComponent("CORRECT_APP_NAME", () => App)

I also made sure that the project name was consistent across all settings, including app.json.

After that, I deleted the index.android.bundle file located at android/app/src/main/assets/ in the project root.

Then I regenerated the bundle by running the following command in the terminal:

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

This resolved the issue for me.

I was having a react-native-web setup in my react-native project to support web along with android and ios.

In my case, I configured an alias which was supposed to be only in webpack.config.js (for web) and not in babel.config.js (for mobile):

resolve: {
    alias: {
      'react-native$': 'react-native-web',
    },
  },

Once I removed this alias from babel.config.js, mobile part started working correctly and web part was intact as well.
The error: "Invariant Violation: "myAppName" has not been registered" was resolved with this

In my case it was a ts compile issue make sure to compile the code and resolve the error and reload the metro bundler

This issue is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be closed in 7 days.

This issue was closed because it has been stalled for 7 days with no activity.

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Invariant Violation: "myAppName" has not been registered #34893

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Invariant Violation: "myAppName" has not been registered #34893

Description

Description

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Output of npx react-native info

Steps to reproduce

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