Fatal error: Uncaught Error: Class 'Symfony\Component\EventDispatcher\Event' not found in /home/noct-c/www/tanakahashi/vendor/symfony/event-dispatcher/GenericEvent.php:21
Stack trace:
#0 {main}
thrown in /home/noct-c/www/tanakahashi/vendor/symfony/event-dispatcher/GenericEvent.php on line 21