Any idea what is this MYSQL problem

This is for Ib forum db shows this one the main page any idea how to fix it ??

SELECT f.*, c.id as cat_id, c.position as cat_position, c.state as cat_state, c.name as cat_name, c.description as cat_desc,
c.image, c.url, m.member_name as mod_name, m.member_id as mod_id, m.is_group, m.group_id, m.group_name, m.mid
FROM ibf_forums f, ibf_categories c
LEFT JOIN ibf_moderators m ON (f.id=m.forum_id)
WHERE c.id=f.category
ORDER BY c.position, f.position

mySQL error: Can't create/write to file '/tmp/#sql_2479_0.MYI' (Errcode: 13)
mySQL error code:

 

 

 

 

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