mercuryboard has exited with an error

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Unknown column 'a.active_item' in 'on clause'

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Query Error [1054]:
This type of error is reported by MySQL.

Query:
SELECT a.*, u.user_name, u.user_active, g.group_format, f.forum_name, t.topic_title, u2.user_name AS profile_name FROM mb_active a, mb_groups g, mb_users u LEFT JOIN mb_forums f ON f.forum_id=a.active_item LEFT JOIN mb_topics t ON t.topic_id=a.active_item LEFT JOIN mb_users u2 ON u2.user_id=a.active_item WHERE a.active_id = u.user_id AND u.user_group = g.group_id ORDER BY a.active_time DESC

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