Fatal error: Uncaught Error: Class "Symfony\Component\DependencyInjection\Extension\Extension" not found in /var/www/html/booking/vendor/symfony/http-kernel/DependencyInjection/Extension.php:21 Stack trace: #0 {main} thrown in /var/www/html/booking/vendor/symfony/http-kernel/DependencyInjection/Extension.php on line 21