Debian6安装DirectAdmin出现这个是为什么？

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* All parts have been installed *
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Type: /etc/init.d/httpd restart
## REPORT_START
Welcome to DirectAdmin verion 1.43.0!
You are now about to run the install program. If DirectAdmin is already
installed, it may destroy previous data.

The hostname provided is not a valid domain
check the /usr/local/directadmin/scripts/setup.txt
## INSTALL_FAILED
## REPORT_END
Permissions set

System Security Tips:
http://help.directadmin.com/item.php?id=247


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* Cannot find /usr/local/directadmin/conf/directadmin.conf
* Please see this guide:
* http://help.directadmin.com/item.php?id=267
*
授权是对的...