searching for users' posts error

[mtlcore]

I click on "Find all posts by this user.. and get this error:

Fatal error: Call to a member function on a non-object in /home/livefta/public_html/forums/search.php on line 2533

[Dismounted]

Have you edited any files?

[Marco van Herwaarden]

What vBulletin version are you using?

To troubleshoot this, please remove any hacks and disable your plugins, then see if you still have this problem.
Note: To temporarily disable the plugin system, edit config.php and add this line right under <?php

define('DISABLE_HOOKS', true);

If so, reupload all the original vB non-image files (except install.php). Make sure you upload these in ASCII format and overwrite the ones on the server.