Problem adding a user in Mac OS X

Weird… I tried to create an account for a friend on my Powerbook today (Mac OS X Tiger 104.1), and it kept failing. Well, it appeared to work ok (no errors in the GUI), but the account would not be created. I tried a couple of times (thinking I must have hit the wrong button or something), but same result. In the system.log, the following lines appeared:

2005-06-05 09:06:07.121 System Preferences[16863] ### Error:-14120 File:DSRecord.m Line:349
2005-06-05 09:06:07.124 System Preferences[16863] ### Error:-14120 File:DSRecord.m Line:349

A quick google search turned up nothing. So I rebooted and tried again, and it worked. Weird.