Fatal error: Uncaught Error: Interface "OCA\Survey_Client\Categories\ICategory" not found in /home/tzuovhm/tzuovhm/apps/survey_client/lib/Categories/Server.php:18 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps/survey_client/lib/Categories/Server.php on line 18