Problem with Schedule messages

Hi,

When I try to send a schedule message under “Schedule messages” I get this error message in /var/log/playsms/playsms.log

    • 2019-11-06 10:00:59 PID5db14d9fc853f admin L2 schedule_hook_playsmsd # sendsms uid:1 schedule_id:1 id:1 rule:4 schedule:[2019-11-06 10:00:00] scheduled:[2019-11-07 10:00:00]
    • 2019-11-06 10:00:59 PID5db14d9fc853f admin L2 sendsms # start uid:1 sender_id:[1234] smsc:[]
    • 2019-11-06 10:00:59 PID5db14d9fc853f admin L2 sendsms_queue_create # saving queue_code:3114675cbeef58bce5ba721cf5ba350b src:1234 scheduled:2019-11-06 10:00:59
    • 2019-11-06 10:00:59 PID5db14d9fc853f admin L2 sendsms # fail to finalize queue creation, exit immediately

System info:
Distributor ID: Ubuntu
Release: 18.04
PHP version: 7.2.24-0ubuntu0.18.04.1
mysql Version: 14.14
Gammu version: 1.39.0
Playsms version: 1.4.2