Java.net, Apache, and rice on Ubuntu Command line (prompt) tries to connect to localhost and gets connection refused

I tried to use ./synthesize.sh for Bayou on Ubuntu but the connection was refused, nothing works though (I think localhost is not accepting unknown connections, but I can't find any tutorials on how to allow localhost to accept specific connections). Help is very much appreciated, thank you!

Ubuntu Version = 18.04

Installations = TensorFlow, sci-kit learn, flask, SDK java, and python 3 virtual-env

Error caused by: java.net.ConnectException: Connection refused (Connection refused)

Exception: Connect to localhost:8080 [localhost/127.0.0.1] failed: Connection refused (Connection refused)

This is NOT a website issue. Any ideas or solutions, help will be very much appreciated.