IredMail installation

==== Required information ====
- iRedMail version: 0.8.4
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Ubuntu 12.10.1
- Related log if you're reporting an issue: /
====

Greetings, developers and fellow IRedMail-ers

I have a problem... (obviously). I am trying to install iRedMail on a server over Putty, cuz I don't have psyhical access to it. I followed these instructions carefully:

http://www.iredmail.org/install_iredmail_on_ubuntu.html

And now, when I try to enter admin panel at "https://server/iredadmin/", I see the login screen, but when I enter login information, which I get from "iRedMail.tips", I get an Internal Server Error. I turned on Debug mode, and this is what I get:

Line 38 in that file is: auth = core.Auth()

Any ideas? I really have to make this work

I am new here, I just registred. If I did something wrong with posting this (wrong thread, topic, etc...) - I apologize.

Tnx in advance!