Erreur fatale : invalid while request

SELECT aw.id, aw.name, aw.contents, aw.icon, COUNT(w.id) as count
FROM phpboost_web_cat aw
LEFT JOIN phpboost_web w ON w.idcat = aw.id AND w.aprob = 1
WHERE aw.aprob = 1 AND aw.secure <= '-1'
GROUP BY aw.id
ORDER BY aw.class
LIMIT 0, 10

Can't create/write to file '/tmp/#sql_3d49_0.MYI' (Errcode: 13)


Ligne 236 : web.php