complaint from Xfce about address configuration

["Easthope" <peasthope@cablelan.net>]

Hello Debian users,

I had a machine configured with a static address 
and subsequently changed it to use dhcp.  Now 
this message pops up when Xfce is started.

"Could not look up internet address for computer.
This will prevent Xfce from operating correctly.
It may be possible to correct the problem by adding
computer to the file /etc/hosts on your system."

Firefox works but the message is bothersome.

Obviously the old static address can not be left 
in /etc/hosts now that dhcp is used.  How should 
this be fixed.

Thanks,          Peter E.
peasthope at cablelan dot net