منتدى استراحات زايد

Please assist with this database error, is causing my forum not to function properly. New users can't register, people can't access PMs, and people can't view profiles...

Here it is:

PHP Code:
Database error in vBulletin 3.8.4:

Invalid SQL:

SELECT user.*, (user.options & 512) AS invisible , avatar.avatarpath, NOT ISNULL(customavatar.userid) AS hascustom, customavatar.dateline AS avatardateline, customavatar.filedata_thumb, customavatar.height AS avheight, customavatar.width AS avwidth, customavatar.width_thumb AS avwidth_thumb, customavatar.height_thumb AS avheight_thumb

FROM userlist AS userlist
INNER JOIN user AS user ON (user.userid = userlist.relationid)
LEFT JOIN avatar AS avatar ON (avatar.avatarid = user.avatarid)
LEFT JOIN customavatar AS customavatar ON (customavatar.userid = user.userid)

WHERE userlist.userid = 16236
AND userlist.type = 'buddy'
AND userlist.friend = 'yes'

ORDER BY RAND()
LIMIT 0, 8;

MySQL Error : Can't create/write to file '/tmp/#sql_10c6_0.MYI' (Errcode: 13)
Error Number : 1
Request Date : Sunday, January 10th 2010 @ 02:24:42 PM
Error Date : Sunday, January 10th 2010 @ 02:24:42 PM
Script : http://www.egamingsupply.com/forum/member.php?action=getinfo&u=16236
Referrer : http://www.egamingsupply.com/forum/index.php
IP Address : 68.39.148.100
Username : Monarch
Classname : vB_Database
MySQL Version : 5.0.51a-community