Horde Configuration Error - Missing DOMXML or dom PHP extension

Installed Horde and IMP but when trying to configure through "administration" -> "setup" I get:

A fatal error has occurred
You need the domxml or dom PHP extension to use the configuration tool.

[line 26 of /home/jiji/public_html/horde/admin/setup/config.php]

Status: 
Closed (fixed)