Fatal error: Uncaught Error: Class "Sabre\DAV\Auth\Backend\AbstractBasic" not found in /users/ms-it/www/oc/apps/federation/lib/DAV/FedAuth.php:28 Stack trace: #0 {main} thrown in /users/ms-it/www/oc/apps/federation/lib/DAV/FedAuth.php on line 28