MySQL Error!

[Robot]

The Error returned was:
Error writing file '/var/tmp/MYr19AWb' (Errcode: 28)

Error Number:
3

SELECT id, title, date, alt_name, category, flag FROM dle_post WHERE approve='1' AND date >= '2011-05-06 01:38:22' - INTERVAL 1 MONTH AND date < '2011-05-06 01:38:22' ORDER BY rating DESC, comm_num DESC, news_read DESC, date DESC LIMIT 0,10

это что ? я непонел