Has anyone run into this dhcpsrvr error code=19?

"dhcpdecline packet has been received from client <00:1b:77:37:8e:12>"

The error message states ".. Error Code=19 after dhcpsrvr cache has been queried for client <00:1b:77:37:8e:12>

the client's hwd address being specified is a Intel PRO/Wireless 3945ABG network card in a dell latitude d520 running WinXP version 2002 SP2. The wireless card is trying to renew it's ip address. Either the server or the client is refusing the ip, but why... were would I look to see why the address is being refused?

Thank you for the help