Error: Activity class does not exist & Could not find dependency com.facebook.react:react-native:0.78.0

[meriem-majdoul]

Description

Hello,
I'm experiencing two issues when trying to run my React Native app on Android. Here are the details:

Issue 1: Activity class does not exist
When I execute npx react-native run-android, I get the following error:
info Starting the app on "RZ8W90J1ZZE"... Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.synergys/.MainActivity } Error type 3 Error: Activity class {com.synergys/com.synergys.MainActivity} does not exist.
Issue 2: Dependency not found
When I try to build the app in Android Studio, I get this error:
`Could not determine the dependencies of task ':app:compileDebugJavaWithJavac'.

Could not resolve all dependencies for configuration ':app:debugCompileClasspath'.
Could not find com.facebook.react:react-native:0.78.0.
Required by:
project :app

Possible solution:

• Declare repository providing the artifact, see the documentation at https://docs.gradle.org/current/userguide/declaring_repositories.html
  `

Steps to reproduce

1- Verified that the React Native version in package.json is 0.78.0.
2- Added the necessary repositories in android/build.gradle:
allprojects { repositories { mavenCentral() google() maven { url 'https://repo.maven.apache.org/maven2/' } maven { url 'https://oss.sonatype.org/content/repositories/snapshots/' } } }
3- Ran the following commands to clean and rebuild:

cd android
./gradlew clean
./gradlew build

4- Verified that MainActivity.java exists in android/app/src/main/java/com/synergys/.

React Native Version

0.78.0

Affected Platforms

Build - Windows

Output of npx @react-native-community/cli info

System:
  OS: Windows 10 10.0.19045
  CPU: (4) x64 Intel(R) Core(TM) i5-3427U CPU @ 1.80GHz
  Memory: 8.87 GB / 15.87 GB
Binaries:
  Node:
    version: 22.13.1
    path: C:\nvm4w\nodejs\node.EXE
  Yarn:
    version: 1.22.19
    path: ~\AppData\Roaming\npm\yarn.CMD
  npm:
    version: 10.9.2
    path: C:\nvm4w\nodejs\npm.CMD
  Watchman: Not Found
SDKs:
  Android SDK:
    API Levels:
      - "28"
      - "29"
      - "30"
      - "31"
      - "32"
      - "33"
      - "34"
      - "35"
    Build Tools:
      - 29.0.2
      - 30.0.2
      - 30.0.3
      - 31.0.0
      - 33.0.1
      - 33.0.2
      - 34.0.0
      - 35.0.0
    System Images:
      - android-28 | Google Play Intel x86 Atom
    Android NDK: Not Found
  Windows SDK: Not Found
IDEs:
  Android Studio: AI-242.23726.103.2422.12816248
  Visual Studio: Not Found
Languages:
  Java: 17.0.12
  Ruby: Not Found
npmPackages:
  "@react-native-community/cli":
    installed: 15.0.1
    wanted: 15.0.1
  react:
    installed: 19.0.0
    wanted: ^19.0.0
  react-native:
    installed: 0.78.0
    wanted: ^0.78.0
  react-native-windows: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: false
  newArchEnabled: true
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found

npm notice
npm notice New major version of npm available! 10.9.2 -> 11.1.0
npm notice Changelog: https://github.com/npm/cli/releases/tag/v11.1.0
npm notice To update run: npm install -g [email protected]
npm notice

Stacktrace or Logs

Could not determine the dependencies of task ':app:compileDebugJavaWithJavac'.
> Could not resolve all dependencies for configuration ':app:debugCompileClasspath'.
   > Could not find com.facebook.react:react-native:0.78.0.
     Required by:
         project :app

Possible solution:
 - Declare repository providing the artifact, see the documentation at https://docs.gradle.org/current/userguide/declaring_repositories.html

Reproducer

https://github.com/meriem-majdoul/Siamtec

Screenshots and Videos

No response

[sarthak-d11]

Hey @meriem-majdoul , I am unable to access you reproducer which you have shared(https://github.com/meriem-majdoul/Siamtec). It will be great if you can share a valid reproducer

[cipolleschi]

The reproducer does not exists.

Can you check if everything works fine in a completely new app?

npx @react-native-community/cli init NewApp --version 0.78.0

[react-native-bot]

Warning

Missing reproducer: We could not detect a reproducible example in your issue report. Please provide either:

• If your bug is UI related: a Snack
• If your bug is build/upgrade related: a project using our Reproducer Template
• Otherwise send us a Pull Request with the RNTesterPlayground.js edited to reproduce your bug.

[meriem-majdoul]

@sarthak-d11 , @cipolleschi Hello, the reproducer is now available. You can access it via the following link: https://github.com/meriem-majdoul/Siamtec. Feel free to share your feedback or questions. Thank you!

[cipolleschi]

@meriem-majdoul I see that the reproducer uses Firebase. It could be hard for us to test it with firebase involved, because we would need a firebase key. Is firebase necessary to trigger the issue? If not, can you remove it?