Fatal error: Class 'Symfony\Component\EventDispatcher\Event' not found in /var/www/html/dev/spa/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Event/PostResponseEvent.php on line 25

Call Stack:
    0.0003     236984   1. {main}() /var/www/html/dev/spa/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Event/PostResponseEvent.php:0