Fatal error: Uncaught Error: Class 'Symfony\Component\EventDispatcher\GenericEvent' not found in /home/optinadmin/rfl.optin.co.nz/concrete/src/Block/Events/BlockEvent.php:9 Stack trace: #0 {main} thrown in /home/optinadmin/rfl.optin.co.nz/concrete/src/Block/Events/BlockEvent.php on line 9