MySQL error in file: /engine/modules/topnews.php at line 51

Error Number: 1021

The Error returned was:
Disk full (/var/tmp/#sql_e26_0); waiting for someone to free some space...

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 >= '2019-04-24 10:09:09' - INTERVAL 1 MONTH AND p.date < '2019-04-24 10:09:09' ORDER BY rating DESC, comm_num DESC, news_read DESC, date DESC LIMIT 0,8