Fatal error: Uncaught Error: Interface "Sabre\DAV\INode" not found in /var/www/apache/dev/cal/web/vendor/sabre/dav/lib/DAVACL/IPrincipal.php:16 Stack trace: #0 {main} thrown in /var/www/apache/dev/cal/web/vendor/sabre/dav/lib/DAVACL/IPrincipal.php on line 16