MySQL error in file: /engine/init.php at line 402

Error Number: 1

The Error returned was:
Can't create/write to file '/tmp/#sql_465_0.MYI' (Errcode: 28)

SQL query:

SELECT category, COUNT(*) AS count FROM dle_post WHERE approve=1 AND date < '2021-09-26 03:34:59' GROUP BY category