Fatal error: Uncaught Error: Interface "Firebase\Auth\Token\Domain\Generator" not found in C:\xampp\htdocs\www\prohelp\vendor\kreait\firebase-php\src\Firebase\Auth\CustomTokenViaGoogleIam.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\www\prohelp\vendor\kreait\firebase-php\src\Firebase\Auth\CustomTokenViaGoogleIam.php on line 21