<h2 id="heading-introduction">Introduction</h2>
<p>In this article, we will cover the fix for [core/duplicate-app] A Firebase App named "[DEFAULT]" already exists exception.</p>
<p>If you tried running your Flutter app that's using a Firebase product you might see this error if your <code>GoogleService-Info.plist</code> or <code>google-services.json</code> files are outdated.</p>
<pre><code class="lang-plaintext">[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: [core/duplicate-app] A Firebase App named "[DEFAULT]" already exists
</code></pre>
<h2 id="heading-solution">Solution</h2>
<p>To fix the <code>core/duplicate-app] A Firebase App named "[DEFAULT]" already exists</code> exception follow these two simple steps</p>
<ol>
<li><p>Delete your <code>google-services.json</code> located at <code>android/app/google-services.json</code> if running on Android or delete your <code>GoogleService-Info.plist</code> located at <code>macos/Runner/GoogleService-Info.plist</code> if running on MacOS or <code>ios/Runner/GoogleService-Info.plist</code> if running on IOS.</p>
</li>
<li><p>Install and Run the flutterFire CLI in the root of your flutter project directory.</p>
</li>
</ol>
<p>If flutterFire CLI is not already installed run</p>
<pre><code class="lang-plaintext">$ dart pub global activate flutterfire_cli
</code></pre>
<p>Next Run</p>
<pre><code class="lang-plaintext">$ flutterfire configure --project=&lt;yourprojectID&gt;
</code></pre>
<p>Follow the instructions in your terminal.</p>
<p>Your Flutter project should now run successfully.</p>
<h2 id="heading-connect-with-me">Connect with me</h2>
<p>Thank you for reading my post. Feel free to connect with me.</p>


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a Firebase product you might see this error if your `GoogleService-Info.plist` or `google-services.json` files are outdated.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

## Connect with me

Thank you for reading my post. Feel free to connect with me.

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

Introduction

Solution

Connect with me