most likely caused by a modification plugin or some corrupt files.

try this

[/B]Admin CP -> Maintenance -> Diagnostics -> Suspect File Versions
Nothing comes up for search.php

[Note: In some cases you may also need to remove any of the listed .xml files in the includes/xml directory.]

Next, disable all plugins.
Tried

Note: To temporarily disable the plugin system, edit config.php and add this line right under <?php

define('DISABLE_HOOKS', true);

Then if you still have this problem, create a new style and choose no parent style. This will force it to use the default templates. Finally empty your browser cache, close all browser windows then try again. Make sure you change to the new style and view your forums with it. Do you have the same problem?
It happens on more than 1 skin and on more than 5 comps

Thanks for the suggestions.
Chri5 Reviewed by Chri5 on . vBulletin DB Error I need help fixing it. I get it while searching from clicking the "find all users post" link. Rating: 5