Seems jinja2 has change a bit and ckbunker need some adaptation. I am having this error with jinja2 version 3.1.2: > AttributeError: module 'jinja2' has no attribute 'escape' Reading https://jinja.palletsprojects.com/en/3.1.x/changes/ I see > Markup and escape should be imported from MarkupSafe. I downgraded to 3.0.3 and now everything works well. > pip uninstall jinja2 > pip install jinja2==3.0.3