Database Error

DB Error: unknown error

SELECT Grief.title, GriefCategory.name, Grief.email, Grief.phone, Grief.fax, Grief.description, Grief.url FROM Grief JOIN GriefCategory ON Grief.grief_category_id=GriefCategory.id WHERE displayed = 1 ORDER BY GriefCategory.name, Grief.title [nativecode=1 ** Can't create/write to file '/var/tmp/#sql_5ca_0.MAI' (Errcode: 28)]