I figured out there was something missing. I'm working on an update to correct this. Once I get it ready, please check it out and let me know if there are any other changes.
You'll have to add the helper files to the /config/hook/ folder. Update the docker without the INSTALL_HOOK variable, then copy the helper files to for /hook/zmes_hook_helper/ folder, then restart the docker with INSTALL_HOOK="1". Should be up and running at that point.
Edit: The zmes_hook_helpers files are included in the docker now.