MySQL error in file: /engine/cache/system/plugins/b713065c65622a52a10f57fa6b8919a9.php at line 2183

Error Number: 1021

The Error returned was:
Disk full (/var/lib/mysql/mysqltmp/#sql_1716_15); waiting for someone to free some space...

SQL query:

SELECT p.id, p.autor, p.date, p.short_story, CHAR_LENGTH(p.full_story) as full_story, p.xfields, p.title, p.descr, p.keywords, p.category, p.alt_name, p.comm_num, p.allow_comm, p.allow_main, p.approve, p.fixed, p.symbol, p.tags, e.news_read, e.allow_rate, e.rating, e.vote_num, e.votes, e.view_edit, e.disable_index, e.editdate, e.editor, e.reason FROM dle_post p INNER JOIN (SELECT DISTINCT(dle_post_extras_cats.news_id) FROM dle_post_extras_cats WHERE cat_id IN ('39')) c ON (p.id=c.news_id) LEFT JOIN dle_post_extras e ON (p.id=e.news_id) WHERE approve=1 AND p.serie_id=0 ORDER BY year DESC LIMIT 0,20