Fatal error: Uncaught Error: Interface "Symfony\Contracts\EventDispatcher\EventDispatcherInterface" not found in /home/appgulf1/elevator.hifisys.com/elevator/vendor/symfony/event-dispatcher/EventDispatcherInterface.php:23 Stack trace: #0 {main} thrown in /home/appgulf1/elevator.hifisys.com/elevator/vendor/symfony/event-dispatcher/EventDispatcherInterface.php on line 23