Fatal error: Uncaught Error: Class 'Symfony\Contracts\EventDispatcher\Event' not found in G:\projects\stage.api.edutalk.edu.vn\vendor\symfony\http-kernel\Event\KernelEvent.php:23 Stack trace: #0 {main} thrown in G:\projects\stage.api.edutalk.edu.vn\vendor\symfony\http-kernel\Event\KernelEvent.php on line 23