Error when posting new thread

first thing first, disable your products, by editing the file : /includes/config.php
on top of it, below the <?php , add this:

PHP Code:

# FOR SECURITY REASON:  uncomment if a plugin ++++up your site!
define('DISABLE_HOOKS', true); 


(you will be able to reactivate the hooks by deleting this line after the check is done.)

if your problem is absent after that, you can evaluate what is the problem by analysing what product is related to posts...

if nothing is good, i would recommand going here:
http://members.vbulletin.com/members...ontactform.php