Error deleting last empty folder

[tflidd]

This is a frequently asked question:

File is locked - how to unlock

You can't access files because they are locked and you find such errors in your logfile: {"reqId":"0DijSqEkfOg2iyh9VD8J","remoteAddr":"xx.xx.xx.xx","app":"webdav","message":"Exception: {\"Message\":\"HTTP\\\/1.1 423 \\\"path\\\/file.extension\\\" is locked\",\"Exception\":\"OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Exception\\\\FileLocked\",\"Code\":0,\"Trace\":\"#0 If you're running the ownCloud 8.2.x branch make sure that you're using at least 8.2.2 (previous versions had a bug causing this iss…