postgresql - I can't run jobs on PgAgent on Postgresql

Question

I installed pgagent on Ubuntu 16.04.

I executed:

CREATE EXTENSION pgagent;
CREATE LANGUAGE plpgsql;

According this: https://www.pgadmin.org/docs/pgadmin4/1.x/pgagent_install.htm

I ran

/usr/bin/pgagent hostaddr=127.0.0.1 user=my_user password=*****

And created my jobs:

But, when I try to execute, nothing happens. No error, messages, nothing. And functions are not executed.

I do not know where to start solving this