Oddly enough, it may have to do with the Chess game application - at least it did in the past. Just about all reports of this error that I can find date from Panther days, except for a recent set with reference to the Japanese version of DU under Leopard.
http://forums.macosxhints.com/showthread.php?t=91770
[Disk Utility Internal Error. Disk Utility has lost its connection with the Disk Management Tool and cannot continue. Please quit and relaunch Disk Utility.|http://www.macintosh-data-recovery.com/blog/disk-utility-internal-erro r> Explanation of error. Note that this is a software vendor so some of the advice is to buy the vendor's software!
Message was edited by: Limnos