Squid hostname error

[root@sawi squid]# less /var/log/squid/squid.out
[root@sawi squid]# vim squid.conf
[root@sawi squid]# service squid start
init_cache_dir /var/spool/squid... /etc/init.d/squid: line 62: 13530 Aborted $SQUID -z -F -D >> /var/log/squid/squid.out 2>&1
Starting squid: /etc/init.d/squid: line 42: 13532 Aborted $SQUID $SQUID_OPTS >> /var/log/squid/squid.out 2>&1
[FAILED]
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#add below line for above error

visible_hostname [your_hostname]