memberlist Error database

[Jackie1]

Hello, I do not understand why my forum database errors when accessing Memberlist. I tried remove all the plugin forum but failed.

I have check the server everything, my website source test run on normal Memberlist alone with my site.

Database error in vBulletin 3.8.4:

Invalid SQL:

SELECT user.*,usertextfield.*,userfield.*, user.userid, options,
IF(displaygroupid=0, user.usergroupid, displaygroupid) AS displaygroupid, infractiongroupid



, lastactivity AS lastvisittime



FROM user AS user
LEFT JOIN usertextfield AS usertextfield ON(usertextfield.userid=user.userid)
LEFT JOIN userfield AS userfield ON(userfield.userid=user.userid)





WHERE 1=1
AND (user.usergroupid IN (-1,6,30,28,7,31,5,27,2,34,35,36,3,29,41))

ORDER BY user.username asc
LIMIT 0, 30;

MySQL Error : Error writing file '/tmp/MYMSTlj1' (Errcode: 28)
Error Number : 3
Request Date : Thursday, October 22nd 2009 @ 09:13:12 PM
Error Date : Thursday, October 22nd 2009 @ 09:13:12 PM
Script : http://www.khoahocphothong.net/forum/memberlist.php
Referrer :
IP Address : ******
Username : *****
Classname : vB_Database
MySQL Version : 5.0.81-community

Now here is my test website : http://caothu.vn/memberlist.php