[i18n] problems with translation.php

[Leena Heino]

When I try to update or make help.xml files I keep getting the error:
Fatal error: Call to undefined method Horde_DOM_Node::get_attribute()

Horde frameworks packages are installed with install-packages.php

Php version:
PHP 5.2.5 (cli) (built: Nov 28 2007 19:34:17)
Copyright (c) 1997-2007 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies

Gettext version:
gettext version: 0.17 OK

-- 
   Leena Heino              University of Tampere / Computer Centre
   ( liinu at uta.fi )      ( http://www.uta.fi/laitokset/tkk )