I am getting this error when:
*trying to access forums(/orca) from top page.
*trying to access Orca Forum and Ray Suite links from admin panel under the "Plugins" menu.

Every requirements met on the server side.
register_globals is OFF
fixed the 2nd line in the .htaccess file but nothing is working.

Also tried all php handlers DSO, CGI and suPHP, result is same.

Server is Centos 5.3, Apache 2.2 with PHP 5.2.11 installed.