Fatal error: Uncaught Error: Interface "Kreait\Firebase\Auth\SignIn\Handler" not found in /home/pricemat/public_html/vendor/kreait/firebase-php/src/Firebase/Auth/SignIn/GuzzleHandler.php:31 Stack trace: #0 {main} thrown in /home/pricemat/public_html/vendor/kreait/firebase-php/src/Firebase/Auth/SignIn/GuzzleHandler.php on line 31