Fatal error: Uncaught Error: Interface "OCP\IAddressBook" not found in /home/tzuovhm/tzuovhm/apps_/dav/lib/CardDAV/AddressBookImpl.php:18 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps_/dav/lib/CardDAV/AddressBookImpl.php on line 18