httpd service failed to start

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i am using fedora 18 with required packages to start httpd service but it is failed to start. I am getting following errors-

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[root@air-book suthar]# systemctl start httpd
Job for httpd.service failed. See 'systemctl status httpd.service' and 'journalctl -xn' for details.
[root@air-book suthar]# systemctl status httpd.service
httpd.service - The Apache HTTP Server
      Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled)
      Active: failed (Result: exit-code) since Wed 2013-04-03 17:06:41 IST; 14s ago
     Process: 21718 ExecStop=/usr/sbin/httpd $OPTIONS -k graceful-stop (code=exited, status=0/SUCCESS)
     Process: 21713 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)

Apr 03 17:05:52 air-book httpd[21713]: AH00557: httpd: apr_sockaddr_info_get() failed for air-book
Apr 03 17:05:52 air-book httpd[21713]: AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 127.0....s message
Apr 03 17:06:23 air-book systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE
Apr 03 17:06:41 air-book httpd[21718]: AH00557: httpd: apr_sockaddr_info_get() failed for air-book
Apr 03 17:06:41 air-book httpd[21718]: AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 127.0....s message
Apr 03 17:06:41 air-book httpd[21718]: httpd (no pid file) not running
Apr 03 17:06:41 air-book systemd[1]: Failed to start The Apache HTTP Server.
Apr 03 17:06:41 air-book systemd[1]: Unit httpd.service entered failed state
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link to download my /etc/hosts and /etc/httpd/conf/httpd.conf files... /etc/hosts /etc/httpd/conf/httpd.conf

please help me.