Fatal error: Uncaught Error: Class "Sabre\DAV\ServerPlugin" not found in /var/www/html/nextcloud/apps/dav/lib/Connector/Sabre/CopyEtagHeaderPlugin.php:20 Stack trace: #0 {main} thrown in /var/www/html/nextcloud/apps/dav/lib/Connector/Sabre/CopyEtagHeaderPlugin.php on line 20