How to fix core/duplicate-app] A Firebase App named "[DEFAULT]" already exists error

Introduction

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using a firebase product you might see this error if your GoogleService-Info.plist or google-services.json files are outdated.

[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: [core/duplicate-app] A Firebase App named "[DEFAULT]" already exists

Solution

To fix the core/duplicate-app] A Firebase App named "[DEFAULT]" already exists exception follow these two simple steps

Delete your google-services.json located at android/app/google-services.json if running on android or delete your GoogleService-Info.plist located at
macos/Runner/GoogleService-Info.plist if running on MacOS or ios/Runner/GoogleService-Info.plist if running on IOS.
Install and Run the flutterFire CLI in the root of your flutter project directory.

If flutterFire CLI not already installed run

$ dart pub global activate flutterfire_cli

Next Run

$ flutterfire configure --project=<yourprojectID>

Follow the instructions in your terminal.

Your flutter project should now run successfully.

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