Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in /home/iotechtniu/ioacademy/vendor/knplabs/knp-components/src/Knp/Component/Pager/Event/ItemsEvent.php:10 Stack trace: #0 {main} thrown in /home/iotechtniu/ioacademy/vendor/knplabs/knp-components/src/Knp/Component/Pager/Event/ItemsEvent.php on line 10