Was OCA\DAV für eine Fehler meldung (Fatal)

NC 11.0.1

Was bedeutet diesesr Fehler und was kann ich dagegen Tun?

OCA\DAV\Connector\Sabre\Exception\FileLocked: HTTP/1.1 423 "Personal/Krank-Urlaub-Tage/URLAUBSTAGE.XLS" is locked

/www/htdocs/w00c7c59/next/3rdparty/sabre/dav/lib/DAV/Server.php - line 1106: OCA\DAV\Connector\Sabre\File->put(Resource id #519)
/www/htdocs/w00c7c59/next/3rdparty/sabre/dav/lib/DAV/CorePlugin.php - line 513: Sabre\DAV\Server->updateFile('Personal/Krank-...', Resource id #519, NULL)
[internal function] Sabre\DAV\CorePlugin->httpPut(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
/www/htdocs/w00c7c59/next/3rdparty/sabre/event/lib/EventEmitterTrait.php - line 105: call_user_func_array(Array, Array)
/www/htdocs/w00c7c59/next/3rdparty/sabre/dav/lib/DAV/Server.php - line 479: Sabre\Event\EventEmitter->emit('method PUT', Array)
/www/htdocs/w00c7c59/next/3rdparty/sabre/dav/lib/DAV/Server.php - line 254: Sabre\DAV\Server->invokeMethod(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
/www/htdocs/w00c7c59/next/apps/dav/appinfo/v1/webdav.php - line 60: Sabre\DAV\Server->exec()
/www/htdocs/w00c7c59/next/remote.php - line 165: require_once('/www/htdocs/w00...')
{main}