Fatal error: Uncaught Error: Interface "Kreait\Firebase\Auth\SignIn\Handler" not found in /home/keshavvps/public_html/keshav/KG2/Shir/vendor/kreait/firebase-php/src/Firebase/Auth/SignIn/GuzzleHandler.php:36 Stack trace: #0 {main} thrown in /home/keshavvps/public_html/keshav/KG2/Shir/vendor/kreait/firebase-php/src/Firebase/Auth/SignIn/GuzzleHandler.php on line 36