Fatal error: Uncaught Error: Interface "OCP\EventDispatcher\IEventListener" not found in /home/tzuovhm/tzuovhm/apps_/spreed/lib/Chat/SystemMessage/Listener.php:56 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps_/spreed/lib/Chat/SystemMessage/Listener.php on line 56