Fatal error: Uncaught Error: Class "Symfony\Component\DependencyInjection\Extension\Extension" not found in /var/www/html/vendor/symfony/debug-bundle/DependencyInjection/DebugExtension.php:29 Stack trace: #0 {main} thrown in /var/www/html/vendor/symfony/debug-bundle/DependencyInjection/DebugExtension.php on line 29