Error when I go to edit a calendar event

[GSX-Racing]

Can anyone help me out with fixing this. I can delete events, I can move events from the calendar, but when I go to edit an event I get this error.

Database error in vBulletin 3.5.4:

Invalid SQL:

                   SELECT postid
                   FROM vb3_post
                   WHERE threadid = 
                   ORDER BY dateline
                   LIMIT 1;

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 'ORDER BY dateline
                   LIMIT 1' at line 4
Error Number : 1064
Date         : Friday, March 24th 2006 @ 10:12:35 PM
Script       : http://www.groundpilots.com/vb/calendar.phtml
Referrer     : http://www.groundpilots.com/vb/calendar.phtml?do=getinfo&e=26&day=2006-4-9

I did install the Attendance mod so that must be where something went wrong.

Thanks in advance

I think the problem lies within the event forums plugin... because if I disable that... I can edit no problem.