Job was not scheduled on my PostgreSQL 9.5

Hi,

I've successfully installed pg_cron on my PostgreSQL 9.5.
The postgresql.log echos "LOG: pg_cron scheduler started";
But after i add a job, the job was not scheduled, and there were no exec logs for the job in postgresql.log.

cron.job table data:
2 0 10 * * * insert into aa values(2) localhost 5432 xxx xxx true (null)

Kindly, guide me how to overcome this problem. If there is any bug, please fix it as soon as possible.

Attachment is the postgresql.log for your refference.
[postgresql-2020-11-03_092924.log](https://github.com/citusdata/pg_cron/files/5478902/postgresql-2020-11-03_092924.log)

Thank You.