Fatal error: Uncaught Error: Class "Symfony\Component\HttpFoundation\Session\Storage\Handler\AbstractSessionHandler" not found in /var/www/html/festival/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php:19 Stack trace: #0 {main} thrown in /var/www/html/festival/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php on line 19