Error configuring flask-babel method jinja2 not found

Question

This is my babel.cfg file:

[python: **.py]
[jinja2: **/templates/**.html]

When I execute this command:

pybabel extract -F babel.cfg -k _l -o messages.pot .

Then return this error:

ValueError: Unknown extraction method 'jinja2'

¿How is it possible? That example of config is literally gotten from docs

Answer 1

Surprisingly:

sudo pip install --upgrade setuptools

Updating the setuptools on my mac and now it works...