Fatal error: Uncaught Error: Interface "Sabre\DAV\IFile" not found in /var/www/html/ilias/components/ILIAS/WebDAV/classes/dav/class.ilDAVProblemInfoFile.php:25 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/WebDAV/classes/dav/class.ilDAVProblemInfoFile.php on line 25