MySQL error in file: /engine/init.php at line 400

Error Number: 3

The Error returned was:
Error writing file '/tmp/MYvRtPSh' (Errcode: 28 - No space left on device)

SQL query:

SELECT category, COUNT(*) AS count FROM dle_post WHERE approve=1 AND date < '2025-04-24 03:41:20' GROUP BY category