Database Error - Please please help!

I got this, please tell me what I need to do to fix it!!

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Database error in vBulletin: Invalid SQL: SELECT user.username AS
uuname,COUNT(*) AS posts,userid.userid AS uuid FROM post,user WHERE
dateline<=989640000 AND dateline>=989553600 AND post.userid>0 AND
user.userid=post.userid GROUP BY post.username ORDER BY posts DESC
mysql error: Unknown table 'userid' in field list
mysql error number: 1109
Date: Saturday 12th of May 2001 12:23:15 AM
Script: /forums/

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Thanks!

[tubedogg]

This is not the forum for this, because that error was generated due to my hack. In any case, though, the fix is right here.