Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\EventListener\AbstractSessionListener' not found in /home/itscm/dev.its.cm/apps/vendor/symfony/framework-bundle/EventListener/SessionListener.php:26 Stack trace: #0 {main} thrown in /home/itscm/dev.its.cm/apps/vendor/symfony/framework-bundle/EventListener/SessionListener.php on line 26