database error

[alihs]

Database error in vBulletin 3.0.0 Beta 3:

Invalid SQL:

SELECT forum.forumid, lastpost, lastposter, lastthread, lastthreadid, lasticonid, threadcount, replycount, lastpostid

FROM forum AS forum;

MySQL Error : Unknown column 'lastthread' in 'field list'
Error Number : 1054
Date : Saturday, February 9th 2008 @ 09:59:22 AM
Script : http://www.norapidshare.com/index.php
Referrer :
IP Address : 203.81.218.52
Username : optimum
Classname : vB_Database

i fix it and it happens again. just now a person posted that he is doin it. how to stop him and repair the problem