after installing the lastest version of MediaWiki (V1.12.0), a blank page is displayed when accessing the site.

php error log shows:

PHP Fatal error: Class ‘DOMDocument’ not found in /path/to/wiki/includes/Preprocessor_DOM.php on line 566, referer: http://path/to/wiki/config/index.php

previous versions didn’t have this problem.

this was installed on fedora core 5 server. after some researches, i found that you need to install php-xml component to run (as root):

i don’t have root access to that particular server, so i found an alternate quick fix. add the following to LocalSettings.php: