Forum PM Problem

[محروم.كوم]

One member has consistently had problems with their PM's.

Every PM they sent resulted in me getting a database error and the e-mail detailing the content of the PM.
Now* i get this for each PM they are sent* they cannot see the content of the PM* when they click on it the error happens

Database error in vBulletin 4.0.0:

Invalid SQL:

SELECT pm.** pmtext.*
* icon.title AS icontitle* icon.iconpath
FROM pm AS pm
LEFT JOIN pmtext AS pmtext ON(pmtext.pmtextid = pm.pmtextid)
LEFT JOIN icon AS icon ON(icon.iconid = pmtext.iconid)
WHERE pm.userid=111 AND pm.folderid=0

ORDER BY pmtext.dateline DESC
LIMIT 0* 50;

MySQL Error : Can't create/write to file '/tmp/#sql_523_0.MYD' (Errcode: 17)
Error Number : 1
Request Date : Friday* December 25th 2009 @ 06:08:34 PM
Error Date : Friday* December 25th 2009 @ 06:08:34 PM
Script : http://www.taysidebikers.co.uk/forums/private.php
Referrer : http://www.taysidebikers.co.uk/forums/index.php
IP Address : removed for security
Username : 748SPS
Classname : vB_Database
MySQL Version :

Any ideas? __DEFINE_LIKE_SHARE__