fqdn no more

[nano@xmission.com]

Hi all,
After I finished configuring apache2, I run /etc/init.d/apache2 restart and I
got the following:

"Forcing reload of webserver: Apache2 apache2: could not determine the
server's fully qualified domain name, using 127.0.0.1 for ServerName"

I have my webserver's ip address and domain name in the hosts file

What happened?
Please help.

Fernando