Fatal error: Uncaught Error: Class "OCP\Collaboration\Reference\ADiscoverableReferenceProvider" not found in /home/tzuovhm/tzuovhm/apps_/richdocuments/lib/Reference/OfficeTargetReferenceProvider.php:21 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps_/richdocuments/lib/Reference/OfficeTargetReferenceProvider.php on line 21