Fatal error: Uncaught Error: Interface "OCP\Collaboration\Resources\IProvider" not found in /home/tzuovhm/tzuovhm/apps_/spreed/lib/Collaboration/Resources/ConversationProvider.php:25 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps_/spreed/lib/Collaboration/Resources/ConversationProvider.php on line 25