[PHP & MySQL] Navigation Links einpaar fragen

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SQL-DATABASE ERROR

Database error in WoltLab Burning Board: Invalid SQL: SELECT u.userid, u.username, u.invisible, u.receivepm, u.lastactivity, uf.* FROM bb1_users u, bb1_groups g LEFT JOIN bb1_userfields uf ON (u.userid=uf.userid) WHERE u.groupid = g.groupid AND g.ismod=1 ORDER BY u.username ASC 
mysql error: Unknown column 'u.userid' in 'on clause' 
mysql error number: 1054 
Date: 08.09.2008 @ 09:46 
Script: /wbblite/team.php?sid= 
Referer: http://stories.kilu.de/wbblite/index.php?sid=