I suggest doing the following:
- In your Admincp find Maintenance -> Diagnostics -> Suspect File Versions and hit submit.
If there are any files that don't match up, reupload them.
- Now finally edit your /includes/config.php file
Find
Add below
Code:
define('DISABLE_HOOKS', true);
Now, once you have done those steps try doing it again.
If you still get an error I suggest opening a ticket at vBulletin.com.
If it works, try removing the line you added to your config file, if you get the error it means its a modification causing the error and so on.
Hope this helps
Distance