Fatal error: Uncaught Error: Class "OCP\Collaboration\Reference\ADiscoverableReferenceProvider" not found in /home/tzuovhm/tzuovhm/apps_/spreed/lib/Collaboration/Reference/TalkReferenceProvider.php:36 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps_/spreed/lib/Collaboration/Reference/TalkReferenceProvider.php on line 36