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a Firebase product you might see this error if your `GoogleService-Info.plist` or `google-services.json` files are outdated.

```plaintext
[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

1. 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.
    
2. Install and Run the flutterFire CLI in the root of your flutter project directory.
    

If flutterFire CLI is not already installed run

```plaintext
$ dart pub global activate flutterfire_cli
```

Next Run

```plaintext
$ flutterfire configure --project=<yourprojectID>
```

Follow the instructions in your terminal.

Your Flutter project should now run successfully.

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