How to preinstallation

[levi97kovacs]

Hy
I am want to install ispCP Omega on Debian Lenny and on isntallation is wrot this:

Quote: Starting ispCP installation
* Stopping all services: ........ [ Done ]

Pre-installation tasks for Debian

[ERROR] Unable to determine the mimetype of the `preinst` script!

[FATAL] An error occurred during setup process!
Correct it and re-run this program.

Log files are stored in /var/log/ispcp/setup
You can also find help at http://isp-control.net/forum

How to make the preinstallation? I am read this:http://isp-control.net/documentation/howto/hostname and dosn't helped for me!
Please help me.
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Sorry For My BAD English.