Fatal error: Uncaught Error: Interface "Firebase\Auth\Token\Domain\Generator" not found in /home/mapone/public_html/vendor/kreait/firebase-php/src/Firebase/Auth/CustomTokenViaGoogleIam.php:21 Stack trace: #0 {main} thrown in /home/mapone/public_html/vendor/kreait/firebase-php/src/Firebase/Auth/CustomTokenViaGoogleIam.php on line 21