I appreciate you taking the time to try and help people with the installation of Jython, but if you have questions or issues with the instructions in the helper library repo, then please submit an issue like the instructions tell you to do in step 14. There is a link at the bottom of every page. Reiterating them here is going to cause confusion, especially because your instructions are wrong.
Please remove these instructions. Anyone reading this, please ignore these (they are wrong) and follow the instructions in the HL repo.
This error is caused by not performing step 8 (setting up the configuration.py). You will also run into trouble running a manual install along with the beta Jython bundle.