Hi l.falcioni,
I would be glad to assist with your issue. But, it seems we didn't get to the JRS specific steps, because the PostgresSQL database caused the error. Without the steps you performed and the version of the PostgresSQL I won't be able to help you. Please try a different PostgresSQL version. Check out this https://www.postgresql.org/docs/8.2/supported-platforms.html and see the compatibility.