MySQL error in file: /engine/modules/calendar.php at line 182

Error Number: 2006

The Error returned was:
MySQL server has gone away

SQL query:

SELECT DISTINCT DAYOFMONTH(date) as day FROM dle_post WHERE date >= '2025-02-01' AND date < '2025-02-01' + INTERVAL 1 MONTH AND approve=1 AND date < '2025-02-21 21:07:31'