gnome error message

[n3rdBoy .]

hello,
        I have been looking over the Handbook and I cannot find an answer to 
my problem. Every time I start gnome as root or a normal user I get the 
following error message;

                                      "Could not look up internet address 
for .
                                      this will prevent GNOME from operating 
correctly
                                      it may be possible to correct the 
problem by adding
                                      to the file /etc/hosts."

The message suggests adding to /etc/hosts, I've looked at the file and 
several text books and am still not sure what to do.

Thanks heaps,

Brett

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