MySQL error in file: /engine/classes/comments.class.php at line 90

Error Number: 3

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

SQL query:

SELECT video_comments.id, post_id, video_comments.user_id, date, autor as gast_name, video_comments.email as gast_email, text, ip, is_register, name, video_users.email, news_num, comm_num, user_group, lastdate, reg_date, signature, foto, fullname, land, icq, xfields FROM video_comments LEFT JOIN video_users ON video_comments.user_id=video_users.user_id WHERE video_comments.post_id = '10334' ORDER BY date DESC LIMIT 24300,30