Unhandled Exception Core Duplicate App - Latest Information & Updates 2026

Web Reference: Apr 1, 2021 · I am building a flutter app with firebase. The firebase services I am using are Realtime database and Authentication. The app is normally starting as usual without throwing any exception, but while... In this article we will cover the fix for [core/duplicate-app] A Firebase App named "[DEFAULT]" already exists exception. If you tried running your flutter app that's using a firebase product you might see this error if your GoogleService-Info.plist or google-services.jsonfiles are outdated. Nov 29, 2025 · If you’ve worked with Firebase in Flutter, you’ve likely encountered the frustrating error: [core/duplicate-app] A Firebase App named [DEFAULT] already exists. This error occurs when Firebase tries to initialize the default app more than once in your Flutter project.

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How To Fix Unhandled Exception Has Occurred in Your Application If You Click Continue The App

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Last Updated: April 4, 2026

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