مشکل در نصی سی پنل

سلام دوستان موقع نصب سی پنل با این ارور بر میخورم
[root@vpsparse ~]# sh latest
Verifying archive integrity... All good.
Uncompressing Cpanel & WHM Installer..............
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/ __| |_) / _` | '_ \ / _ \ |
| (__| __/ (_| | | | | __/ |
\___|_| \__,_|_| |_|\___|_|


Installer Version v00028 r67293165e2f92b29b5ddfc2fb3a5907c816107aa


Beginning main installation.
2013-02-04 16:34:37 557 ( INFO): cPanel install started at: Mon Feb 4 16:34:37 2013!
2013-02-04 16:34:37 558 ( INFO): This install will take 20-50 minutes depending on your hardware.
2013-02-04 16:34:37 559 ( INFO): Now is the time to go get another cup of coffee/jolt.
2013-02-04 16:34:37 560 ( INFO): The install will log to /var/log/cpanel-install.log.
2013-02-04 16:34:37 561 ( INFO):
2013-02-04 16:34:37 562 ( INFO): Beginning Installation v3
2013-02-04 16:34:37 462 ( INFO): centos 5 (Linux) detected!
hostname: Unknown host
2013-02-04 16:34:37 490 ( INFO): Validating that '' is a FQDN
2013-02-04 16:34:37 496 (ERROR):
2013-02-04 16:34:37 497 (ERROR): ********************* ERROR *********************
2013-02-04 16:34:37 498 (ERROR):
2013-02-04 16:34:37 499 (ERROR): Your hostname () is not set properly. Please
2013-02-04 16:34:37 500 (ERROR): change your hostname to a fully qualified domain name,
2013-02-04 16:34:37 501 (ERROR): and re-run this installer.
2013-02-04 16:34:37 502 (ERROR):
2013-02-04 16:34:37 503 (ERROR): ********************* ERROR *********************
2013-02-04 16:34:37 504 (FATAL): exiting...
Removing /root/installer.lock
هاست نیم رو هم درست کردم اما نشد.
چکار باید بکنم؟