MySQL error in file: /engine/modules/topnews.php at line 37

Error Number: 1

The Error returned was:
Can't create/write to file '/var/tmp/#sql_4866_0.MAI' (Errcode: 28)

SQL query:

SELECT p.id, p.date, p.short_story, p.xfields, p.title, p.category, p.alt_name FROM dle_post p LEFT JOIN dle_post_extras e ON (p.id=e.news_id) WHERE p.approve=1 AND p.date >= '2021-04-20 00:37:06' - INTERVAL 1 MONTH AND p.date < '2021-04-20 00:37:06' ORDER BY rating DESC, comm_num DESC, news_read DESC, date DESC LIMIT 0,10