Fatal error: Class 'Symfony\Component\EventDispatcher\Event' not found in /var/www/html/dev/spa/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Event/KernelEvent.php on line 26

Call Stack:
    0.0003     237360   1. {main}() /var/www/html/dev/spa/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Event/KernelEvent.php:0