MySQL error in file: /engine/modules/webcash/classes/newdb.class.php at line 34

Error Number: 1

The Error returned was:
Can't create/write to file '/tmp/#sql_2f4e_3.MAI' (Errcode: 28 "No space left on device")

SQL query:

SELECT id, date, short_story, xfields, title, category, alt_name, MATCH (title, short_story, full_story, xfields) AGAINST ('Информатика_5класс ') as score FROM dle_post WHERE category = '87' AND MATCH (title, short_story, full_story, xfields) AGAINST ('Информатика_5класс ') AND id != 40675 AND approve=1 ORDER BY score DESC LIMIT 7