MySQL error in file: /engine/modules/wall/index.php at line 72

Error Number: 1

The Error returned was:
Can't create/write to file '/tmp/MYvGG42E' (Errcode: 30 "Read-only file system")

SQL query:

SELECT w.id, w.type, w.type_sim, w.value, w.item_id, w.user_id, w.add_date, w.fixed, u.user_name, u.verification, u.name, u.tariff_id, u.surname, u.company, u.avatar as foto, u.poster, u.user_group, u.story_ru, u.story_lv FROM dm_wall w INNER JOIN dm_users u ON u.user_id = w.user_id WHERE approved = 1 and add_date < '1773880484' AND type IN (1,2,3,4,5,6,7,8,10,11,13) ORDER BY fixed DESC, add_date DESC LIMIT 0,10