Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\DependencyInjection\Extension" not found in /home/zdpktgd/ptc/vendor.old/symfony/security-bundle/DependencyInjection/SecurityExtension.php:71 Stack trace: #0 {main} thrown in /home/zdpktgd/ptc/vendor.old/symfony/security-bundle/DependencyInjection/SecurityExtension.php on line 71