React Native Windows App looks for MainApplication.java file, but my app has MainApplication.kt

[dannyouu]

Problem Description

I have a react native app that runs on both iOS and Android (0.73.0) and when I try to create a windows build following the article here - https://microsoft.github.io/react-native-windows/docs/getting-started
I get the following error:

And after following the steps I still get the same error.

Here's a screenshot of my android folder.

Steps To Reproduce

I Just follow the steps in this article: https://microsoft.github.io/react-native-windows/docs/getting-started

Expected Results

I expect to have my RN app, running on windows.

CLI version

npx react-native -v 12.2.0

Environment

npx react-native info
info Fetching system and libraries information...
System:
  OS: Windows 10 10.0.19045
  CPU: (12) x64 12th Gen Intel(R) Core(TM) i7-1255U 
  Memory: 13.36 GB / 31.69 GB
Binaries:
  Node:
    version: 20.10.0
    path: C:\Program Files\nodejs\node.EXE
  Yarn:
    version: 4.0.2
    path: ~\AppData\Roaming\npm\yarn.CMD
  npm:
    version: 9.6.0
    path: C:\Program Files\nodejs\npm.CMD
  Watchman:
    version: 20231008.002904.0
    path: C:\ProgramData\chocolatey\bin\watchman.EXE
SDKs:
  Android SDK:
    API Levels:
      - "29"
      - "31"
      - "33"
      - "33"
      - "34"
    Build Tools:
      - 29.0.2
      - 30.0.2
      - 30.0.3
      - 33.0.0
      - 33.0.1
      - 33.0.2
      - 34.0.0
    System Images:
      - android-28 | Google APIs Intel x86 Atom
      - android-29 | Intel x86 Atom_64
      - android-29 | Google APIs Intel x86 Atom
    Android NDK: Not Found
  Windows SDK:
    AllowDevelopmentWithoutDevLicense: Enabled
    AllowAllTrustedApps: Enabled
    Versions:
      - 10.0.19041.0
      - 10.0.22621.0
IDEs:
  Android Studio: AI-221.6008.13.2211.9619390
  Visual Studio:
    - 17.8.34330.188 (Visual Studio Professional 2022)
Languages:
  Java:
    version: 17.0.9
    path: C:\Users\YordanIvanov\.jdks\corretto-17.0.9\bin\javac.EXE
  Ruby: Not Found
npmPackages:
  "@react-native-community/cli":
    installed: 12.2.0
    wanted: ^12.1.1
  react:
    installed: 18.2.0
    wanted: 18.2.0
  react-native:
    installed: 0.73.0
    wanted: ^0.73.0
  react-native-windows:
    installed: 0.73.6
    wanted: 0.73.6
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: false
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found

info React Native v0.73.4 is now available (your project is running on v0.73.0).
info Changelog: https://github.com/facebook/react-native/releases/tag/v0.73.4
info Diff: https://react-native-community.github.io/upgrade-helper/?from=0.73.4
info For more info, check out "https://reactnative.dev/docs/upgrading?os=windows".

Target Platform Version

10.0.19041

Target Device(s)

Desktop

Visual Studio Version

Visual Studio 2022

Build Configuration

Debug

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

The newly created app builds flawlessly.

[chrisglein]

I'm confused about seeing an error about MainApplication.java, because neither that nor MainApplication.kt should have any relevance in your windows project. Your windows project will either have C++ or C# files isntead. Can you share the layout of your windows project after you completed the getting started steps?

[jonthysell]

It looks like the error is coming from something called firebase? It doesn't look like that module supports windows.

[dannyouu]

I'm confused about seeing an error about MainApplication.java, because neither that nor MainApplication.kt should have any relevance in your windows project. Your windows project will either have C++ or C# files isntead. Can you share the layout of your windows project after you completed the getting started steps?

Here's a screenshot of the entire tree:

[chrisglein]

It looks like the error is coming from something called firebase? It doesn't look like that module supports windows.

@dannyouu can you share the module dependencies from your package.json?
None of the firebase modules appear to support Windows: https://reactnative.directory/?search=firebase&windows=true

[dannyouu]

It looks like the error is coming from something called firebase? It doesn't look like that module supports windows.

@dannyouu can you share the module dependencies from your package.json? None of the firebase modules appear to support Windows: https://reactnative.directory/?search=firebase&windows=true

Hi Chris, it's too long for a screenshot, here's the pasted code:

"dependencies": {
"@babel/traverse": "7.23.2",
"@growthbook/growthbook-react": "^0.17.0",
"@react-native-async-storage/async-storage": "^1.21.0",
"@react-native-community/cli": "^12.1.1",
"@react-native-community/cli-platform-android": "^12.1.1",
"@react-native-community/netinfo": "^11.0.1",
"@react-native-firebase/analytics": "17.4.3",
"@react-native-firebase/app": "17.4.3",
"@react-native-firebase/remote-config": "17.4.3",
"@react-navigation/bottom-tabs": "^6.4.0",
"@react-navigation/core": "^6.4.9",
"@react-navigation/drawer": "^6.6.6",
"@react-navigation/elements": "^1.3.19",
"@react-navigation/native": "^6.1.8",
"@react-navigation/native-stack": "^6.9.14",
"@reduxjs/toolkit": "^1.7.1",
"@sentry/node": "^7.58.1",
"@sentry/profiling-node": "^1.1.1",
"@sentry/react-native": "5.5.0",
"@sentry/tracing": "^7.45.0",
"@skarlatov/react-event-bus": "2.0.6",
"abab": "^2.0.6",
"axios": "^1.3.4",
"axios-mock-adapter": "^1.20.0",
"date-fns": "^2.28.0",
"emoji-regex": "^10.3.0",
"i18next": "21.9.1",
"immutability-helper": "^3.1.1",
"jwt-decode": "^3.1.2",
"lodash": "^4.17.21",
"normalizr": "^3.6.2",
"react": "18.2.0",
"react-i18next": "^13.2.2",
"react-native": "^0.73.0",
"react-native-aes-crypto": "^3.0.1",
"react-native-bootsplash": "4.1.0",
"react-native-config": "^1.5.1",
"react-native-currency-input": "^1.0.1",
"react-native-device-info": "8.4.8",
"react-native-elements": "^3.4.2",
"react-native-fast-image": "8.5.11",
"react-native-gesture-handler": "^2.14.0",
"react-native-get-random-values": "^1.9.0",
"react-native-gradle-plugin": "^0.71.19",
"react-native-interactable": "^2.0.1",
"react-native-keychain": "^8.1.2",
"react-native-localize": "^2.2.4",
"react-native-orientation-locker": "1.4.0",
"react-native-pager-view": "6.0.0",
"react-native-permissions": "3.2.0",
"react-native-reanimated": "^3.6.0",
"react-native-reanimated-carousel": "^3.5.0",
"react-native-rsa-native": "^2.0.5",
"react-native-safe-area-context": "^4.5.3",
"react-native-screens": "^3.21.0",
"react-native-size-matters": "^0.4.0",
"react-native-svg": "^14.0.0",
"react-native-svg-transformer": "patch:react-native-svg-transformer@patch%3Areact-native-svg-transformer@npm%253A1.1.0%23~/.yarn/patches/react-native-svg-transformer-npm-1.1.0-0268e56ebd.patch%3A%3Aversion=1.1.0&hash=389e8e#",
"react-native-user-inactivity": "^1.2.0",
"react-native-uuid": "^2.0.1",
"react-native-vector-icons": "^10.0.0",
"react-native-vision-camera": "patch:react-native-vision-camera@npm%3A3.6.14#~/.yarn/patches/react-native-vision-camera-npm-3.6.14-4de68f47f3.patch",
"react-native-windows": "0.73.6",
"react-redux": "^7.2.6",
"redux": "^4.1.1",
"redux-persist": "^6.0.0",
"redux-thunk": "^2.4.2",
"ts-node": "10.9.1",
"uuidv4": "^6.2.13"
},
"devDependencies": {
"@babel/core": "^7.21.8",
"@babel/plugin-proposal-nullish-coalescing-operator": "^7.16.7",
"@babel/plugin-proposal-optional-chaining": "^7.16.7",
"@babel/plugin-transform-arrow-functions": "^7.16.7",
"@babel/plugin-transform-shorthand-properties": "^7.16.7",
"@babel/plugin-transform-template-literals": "^7.16.7",
"@babel/preset-typescript": "^7.16.7",
"@babel/runtime": "^7.23.1",
"@cucumber/cucumber": "~8.2.0",
"@react-native-community/eslint-config": "3.0.1",
"@react-native-community/eslint-plugin": "1.1.0",
"@react-native/babel-preset": "^0.73.18",
"@react-native/eslint-config": "^0.73.1",
"@react-native/metro-config": "^0.73.2",
"@react-native/typescript-config": "^0.73.1",
"@testing-library/jest-dom": "5.16.1",
"@testing-library/jest-native": "^5.4.3",
"@testing-library/react-hooks": "^8.0.1",
"@testing-library/react-native": "^12.3.2",
"@types/detox": "^18.1.0",
"@types/jest": "^29.0.3",
"@types/lodash": "^4.14.195",
"@types/react": "^18.2.6",
"@types/react-redux": "^7.1.30",
"@types/react-test-renderer": "^18.0.6",
"@typescript-eslint/eslint-plugin": "^5.9.1",
"@typescript-eslint/parser": "^5.9.1",
"@welldone-software/why-did-you-render": "^7.0.1",
"babel-jest": "^29.6.3",
"cross-env": "^7.0.3",
"dependency-cruiser": "^13.1.0",
"detox": "20.1.0",
"eslint": "^8.40.0",
"eslint-config-prettier": "^8.3.0",
"eslint-plugin-flowtype": "8.0.3",
"eslint-plugin-import": "^2.25.4",
"eslint-plugin-json": "3.1.0",
"eslint-plugin-jsx-a11y": "^6.5.1",
"eslint-plugin-prettier": "^4.0.0",
"eslint-plugin-react": "^7.28.0",
"eslint-plugin-react-hooks": "^4.3.0",
"eslint-plugin-react-native": "4.0.0",
"eslint-plugin-react-native-a11y": "3.3.0",
"eslint-plugin-simple-import-sort": "10.0.0",
"eslint-plugin-sort-keys-fix": "1.1.2",
"eslint-plugin-testing-library": "5.10.3",
"eslint-plugin-unused-imports": "^2.0.0",
"husky": "^7.0.4",
"jest": "^29.6.3",
"jest-circus": "^27.4.6",
"jest-fetch-mock": "^3.0.3",
"jest-html-reporter": "^3.4.2",
"jest-junit": "^16.0.0",
"madge": "^6.1.0",
"metro-config": "^0.80.0",
"mockdate": "^3.0.5",
"msw": "^2.0.3",
"prettier": "2.8.8",
"react-addons-test-utils": "^15.6.2",
"react-devtools": "^4.26.0",
"react-native-codegen": "0.0.12",
"react-test-renderer": "18.2.0",
"reassure": "^0.9.1",
"rimraf": "^5.0.1",
"ts-jest": "^29.1.1",
"typescript": "^5.0.4",
"whatwg-fetch": "^3.6.17"
},
"engines": {
"npm": "please-use-yarn",
"yarn": ">= 4.0.2",
"node": ">=18"
},
"config": {},
"packageManager": "yarn@4.0.2"

[chrisglein]

Thanks, the list of modules is very helpful.
The problem is that among your dependencies are many modules that don't support Windows. Check the directory link I provided above. Particularly the firebase dependencies, but maybe more. For those, follow up with issues on the community modules themselves.