Problems installing Roundcube

[Mole]

Hello!
I've problem described here:
Roundcube 0.3.1. problems - HowtoForge Forums | HowtoForge - Linux Howtos and Tutorials

Now I've so far that enable install possibility in /home/admispconfig/ispconfig/web/roundcubemail/config/main.in.php

But - installation says:

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PCRE:  OK
DOM:  NOT OK(See http://www.php.net/manual/en/intro.dom.php)
Session:  OK
XML:  NOT OK


As far as I know - a I have installed DOM and XML... At least using php_info() function I get:

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DOM
DOM/XML enabled
DOM/XML API Version 20031129
libxml Version 2.7.5
HTML Support enabled
XPath Support enabled
XPointer Support enabled
Schema Support enabled
RelaxNG Support enabled

and

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libxml
libXML support active
libXML Version 2.7.5
libXML streams enabled


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SimpleXML
Simplexml support enabled
Revision $Revision: 1.151.2.22.2.46 $
Schema support enabled


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xml
XML Support active
XML Namespace Support active
libxml2 Version 2.7.5


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xmlrpc
core library version xmlrpc-epi v. 0.51
php extension version 0.51
author Dan Libby
homepage http://xmlrpc-epi.sourceforge.net
open sourced by Epinions.com