arkadaşlar 2 defa db sql hatasıyla karşılaştım. sorun benden kaynaklanıyor sanırım. ama bu konuda bir bilgim yok

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Database error in vBulletin 4.0.3: Invalid SQL: SELECT user.username, (user.options & 512) AS invisible, user.usergroupid, user.lastvisit, session.userid, session.inforum, session.lastactivity, session.badlocation, IF(displaygroupid=0, user.usergroupid, displaygroupid) AS displaygroupid, infractiongroupid FROM session AS session LEFT JOIN user AS user ON(user.userid = session.userid) WHERE session.lastactivity > 1274280122 AND (user.usergroupid NOT IN (3,4) OR user.usergroupid IS lisanssız); MySQL Error : MySQL server has gone away Error Number : 2006 Request Date : Wednesday, May 19th 2010 @ 05:57:02 PM Error Date : Wednesday, May 19th 2010 @ 05:57:11 PM Script : http://forum.dijitaloyuncu.com/forum.php Referrer : http://www.dijitaloyuncu.com/ IP Address : 109.***.***.** Username : Emin Classname : vB_Database MySQL Version :