[squid-users] Could not determine fully qualified hostname

I'm running Squid on Redhat Linux 9.0.

After compiling my squid when I run squid I receive this error message.
I also add visible_hostname in squid.conf but still the same message.

[xxxxxxxxxxxxx]# ./squid -z
FATAL: Could not determine fully qualified hostname. Please set
'visible_hostname'

Squid Cache (Version 2.5.STABLE1-20030204): Terminated abnormally.
CPU Usage: 0.010 seconds = 0.010 user + 0.000 sys
Maximum Resident Size: 0 KB
Page faults with physical i/o: 242
Aborted