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