Skip to main content

Debugging and Common Errors

Common Errors and Solutions​

1. Error: Launching lib/main.dart on sdk gphone x86 in debug mode...​

Solution:

  1. Go to lib → utils → api.dart and make sure your server base URL is correct.
  2. Go to lib → firebase_option.dart and make sure all firebase configurations are set up correctly.
  3. Make sure that your AVD (Android Virtual Device) is correctly configured and working properly.

2. Error: MissingPluginException(No implementation found for method getAll on channel)​

Solution:

  1. Go to the location where the flutter project exists and use the terminal for the below commands: 
    flutter clean
    flutter pub get
  2. Check build.gradle if Google Services plugin is added.
  3. Restart the Android Studio and rebuild the project.

3. Error: RPC Error: Invalid argument(s)​

Solution:

  1. Go to Android Studio Settings → Preferences → Tools → Flutter and Uncheck "Format code on save" option.
  2. Completely delete your project from Android Studio and reopen it.
  3. Restart your computer and check internet connection.

4. Error: Firebase connectionFailed Error​

Solution:

  1. Ensure the JSON file for Firebase configuration has been placed correctly.
  2. Check that your app has internet permission in AndroidManifest.xml.
  3. Verify all Firebase-related dependencies are correctly included in pubspec.yaml.
  4. Make sure your Google-services.json file has the correct SHA-1 key.

5. Error: App crashes when sending notifications​

Solution:

  1. Check that the FCM token is being generated and stored correctly.
  2. Verify that the notification channels are set up correctly.
  3. Ensure proper permissions are set in AndroidManifest.xml.

6. Error: Image assets not showing up​

Solution:

  1. Make sure the paths to image assets in the pubspec.yaml file are correct.
  2. Run flutter clean followed by flutter pub get.
  3. Verify that the images are in the correct format and not corrupted.

Performance Tips​

  1. Memory Usage: Monitor memory usage with the Flutter DevTools.

  2. Render Performance: Use the Timeline view in DevTools to identify expensive build operations.

  3. Widgets Optimization:

    • Use const constructors where possible
    • Implement the shouldRepaint method in custom painters
    • Use RepaintBoundary to isolate repaints

  4. Network Requests:

    • Cache responses when appropriate
    • Implement pagination for large data sets
    • Use proper error handling for network failures