Fatal error: Uncaught Error: Class "Symfony\Component\EventDispatcher\Event" not found in /home/maborneapp/public_html/v4/xibo-cms-4.0.5/vendor/symfony/event-dispatcher/LegacyEventProxy.php:20 Stack trace: #0 {main} thrown in /home/maborneapp/public_html/v4/xibo-cms-4.0.5/vendor/symfony/event-dispatcher/LegacyEventProxy.php on line 20