Database error in vBulletin 4.1.1

[hallianonline]

Database error in vBulletin 4.1.1:

Invalid SQL:

SELECT a.attachmentid
FROM attachment AS a
WHERE
(filedataid = AND userid = 3);

MySQL Error : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AND userid = 3)' at line 4
Error Number : 1064
Request Date : Monday, December 24th 2012 @ 02:18:27 AM
Error Date : Monday, December 24th 2012 @ 02:18:27 AM

Kindly Provide solution how to correct it. due to this error i could not upload attachments