Fatal error: Uncaught Error: Interface "OCP\EventDispatcher\IEventListener" not found in /home/tzuovhm/tzuovhm/apps_/spreed/lib/Settings/BeforePreferenceSetEventListener.php:28 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps_/spreed/lib/Settings/BeforePreferenceSetEventListener.php on line 28