[HM666]

That is probably related to a mod you have installed on the forum. Try this:

Global disable: open your includes>config.php file and find:

<?php

and under place:

define('DISABLE_HOOKS', true);

Save and upload again to your server in the includes directory.

If you find that it works after disabling the plugins globally then re-enable the plugins by putting // in front of the code so it looks like this:

//define('DISABLE_HOOKS', true);

Save and upload again.

Then you will have to go through your mods one by one until you find the one that is causing the conflict.