No Firebase App '[DEFAULT]' has been created Flutter / Dart Origin: On your device OSI layer 7 · Application Last updated 4 Nov 2026

Flutter: [core/no-app] No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp()

A Firebase service was used before Firebase.initializeApp() ran and completed.

Exact message you may see [core/no-app] No Firebase App '[DEFAULT]' has been createdNo Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp()FirebaseException core/no-appFirebase.initializeApp() not called
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Seen on: Flutter Google Cloud

Meaning

Initialise Firebase in main() before runApp, after WidgetsFlutterBinding.ensureInitialized(), and await it. Add DefaultFirebaseOptions.currentPlatform from FlutterFire CLI. In isolates or background handlers initialise again.

Common causes

  • initializeApp not called or not awaited
  • Missing WidgetsFlutterBinding.ensureInitialized()
  • Background message handler isolate not initialised
  • Missing google-services.json / GoogleService-Info.plist
  • Platform options not generated by FlutterFire CLI

⚡ Quick fix

  1. Call await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform); in main
  2. Run flutterfire configure
  3. Initialise in background isolate handlers too

Detailed fix by platform

Flutter

  1. void main() async { WidgetsFlutterBinding.ensureInitialized(); await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform); runApp(const MyApp()); }

How to diagnose

  1. Init — Awaited before use?
  2. Config — Platform files present?
  3. Isolate — Background handler?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: On your device. Errors that are often confused with or caused by this one (click to open):

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