Fatal error: Uncaught Error: Interface "Kreait\Firebase\Auth\SignIn" not found in D:\xampp\htdocs\vendor\kreait\firebase-php\src\Firebase\Auth\SignInAnonymously.php:10 Stack trace: #0 {main} thrown in D:\xampp\htdocs\vendor\kreait\firebase-php\src\Firebase\Auth\SignInAnonymously.php on line 10