Cups repeatedly under TrueNAS

Hello

This isn’t about configuring CUPS, but rather how to install this Docker image as described in the guide:

When I try to install this image as described in this forum guide, using the web GUI (not the shell), I can’t complete the installation.

I have no idea what these error messages mean! It just displays random nonsense about some Python scripts throwing errors.

I’m not a Docker specialist; I have basic Linux skills, but when I can switch a GUI to another language, and then parts of the configuration menus remain in English, and I’m asked questions I don’t understand!!!