Fatal error: Uncaught Error: Class "Kreait\Firebase\Exception\RuntimeException" not found in D:\programs\xampp\htdocs\backend-test\vendor\kreait\firebase-php\src\Firebase\Exception\Messaging\AuthenticationError.php:11 Stack trace: #0 {main} thrown in D:\programs\xampp\htdocs\backend-test\vendor\kreait\firebase-php\src\Firebase\Exception\Messaging\AuthenticationError.php on line 11