Fatal error: Uncaught Error: Interface "Sabre\DAV\ICollection" not found in /home/tzuovhm/tzuovhm/3rdparty_/sabre/dav/lib/CardDAV/IAddressBook.php:18 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/3rdparty_/sabre/dav/lib/CardDAV/IAddressBook.php on line 18