Database Error Question

[محروم.كوم]

Hi this morning i checked my email and there was a Database Error this what it said.

Code:
Database error in vBulletin 3.8.6:

Invalid SQL:
SELECT cat.socialgroupcategoryid AS categoryid, cat.title, COUNT(socialgroup.groupid) AS total

FROM socialgroupcategory AS cat
LEFT JOIN socialgroup AS socialgroup
ON (socialgroup.socialgroupcategoryid = cat.socialgroupcategoryid)

WHERE socialgroup.groupid IS NOT NULL

GROUP BY cat.socialgroupcategoryid
ORDER BY total
LIMIT 0, 40;

MySQL Error : MySQL server has gone away
Error Number : 2006
Request Date : Tuesday, October 5th 2010 @ 07:35:34 AM
Error Date : Tuesday, October 5th 2010 @ 0702 AM
Script : http://uorevolution.net/
Referrer : http://uorevolution.net/
IP Address : 46.109.26.53
Username : Unregistered
Classname : vB_Database
MySQL Version :
Any idea what cause it and how to fix it Thanks. __DEFINE_LIKE_SHARE__