Fatal error: Uncaught Error: Class 'Symfony\Component\EventDispatcher\Event' not found in /home/optinadmin/rfl.optin.co.nz/concrete/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Event/PostResponseEvent.php:24 Stack trace: #0 {main} thrown in /home/optinadmin/rfl.optin.co.nz/concrete/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Event/PostResponseEvent.php on line 24