React Native入门项目iOS模拟器报错：Requiring unknown module "498"

I’ve run into this cryptic module number error before—it’s almost always tied to cached data, incomplete dependency installs, or stale build files. Let’s walk through the most reliable fixes, starting with the official suggestions and moving to deeper cleanup steps:

• Restart Metro Bundler with cache reset
  A plain restart might not clear old cached modules. Close your current Metro terminal window, then run this in your project root:
  npx react-native start --reset-cache
  Keep this running while you re-launch the app.

• Reinstall dependencies and clear package manager cache
  Sometimes modules don’t install properly the first time around:

  • For Yarn users:
    yarn install && yarn cache clean
  • For npm users:
    npm install && npm cache clean --force

• Clean up iOS-specific build files and CocoaPods
  Stale iOS build artifacts often cause weird module-related glitches:

  1. Close the iOS Simulator completely.
  2. Navigate to your iOS directory: cd ios
  3. Deintegrate and re-install CocoaPods to fix dependency mismatches:
     pod deintegrate && pod install
  4. Go back to the project root and clean React Native build caches:
     npx react-native clean
  5. Re-launch the app with: npx react-native run-ios

• Extra troubleshooting tips
  If the above steps don’t resolve the error:

  • Check if you recently added a new third-party library—try temporarily removing it to see if the error goes away (it might be incompatible or misconfigured).
  • Verify your Node.js version matches React Native’s recommended range (avoid bleeding-edge or extremely outdated versions).
  • Delete the entire node_modules folder, then re-run your package manager’s install command before repeating the steps above.

This error is frustrating because the module number gives almost no context, but 9 times out of 10 it’s a cache or dependency issue that these steps will resolve.

内容的提问来源于stack exchange，提问作者SafeFastExpressive