mercuryboard has exited with an error

Can't open file: './f660_sr0231002/tvf_skins.frm' (errno: 24 - Too many open files)

Query Error [1016]:
This type of error is reported by MySQL.

SELECT m.*, s.skin_dir, g.group_perms, g.group_name FROM mb_users m, tvf_skins s, mb_groups g WHERE m.user_id=1 AND s.skin_dir=m.user_skin AND g.group_id=m.user_group

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