The application's client-side can't connect to Firebase because the necessary configuration is missing.

Please ensure you have a .env.local file in your project's root directory with the variables from your Firebase project's web app configuration. You can find these in your Firebase project settings.

NEXT_PUBLIC_FIREBASE_API_KEY=AIza...
NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN=your-project-id.firebaseapp.com
NEXT_PUBLIC_FIREBASE_PROJECT_ID=your-project-id
NEXT_PUBLIC_FIREBASE_STORAGE_BUCKET=your-project-id.appspot.com
NEXT_PUBLIC_FIREBASE_MESSAGING_SENDER_ID=...
NEXT_PUBLIC_FIREBASE_APP_ID=1:...

After adding these variables, you must restart your development server for the changes to take effect.