Forum vBulletin Database Error!
 

This error keeps on appearing in my email, does anyone know how I can fix it:

"Database error in vBulletin 4.2.0:

Invalid SQL:

SELECT dateline, thumbnail_dateline, filename, filesize, visible, attachmentid, counter,
postid, IF(thumbnail_filesize > 0, 1, 0) AS hasthumbnail, thumbnail_filesize,
attachmenttype.thumbnail AS build_thumbnail, attachmenttype.newwindow
FROM attachment
LEFT JOIN attachmenttype AS attachmenttype USING (extension)
WHERE postid = 591
ORDER BY attachmentid;

MySQL Error : Unknown column 'extension' in 'from clause'
Error Number : 1054
Request Date : Friday, November 30th 2012 @ 05:46:57 AM
Error Date : Friday, November 30th 2012 @ 05:46:58 AM
Script : http://doramax264.com/forum/showpost.php
Referrer : http://doramax264.com/forum/threads/...-x264-encoding
IP Address : 143.28.232.29
Username : feima
Classname : vB_Database
MySQL Version :"

Note: I'm not too good with these sort of things so please be as detailed as possible.