Building html documentation with SPHINX, FURO, AUTODOC. Error stylesheet

i try to use SPHINX with the FURO html-theme in my python project. As i try to build the html, the build fails.

I use following conf.py:

# Configuration file for the Sphinx documentation builder.


import os
import sys

sys.path.insert(0, os.path.abspath('../'))


project = 'MyPorject+'
copyright = '2022, XXXXX' 
author = 'XXXX'
release = '0.3.0'


extensions = ['sphinx.ext.autodoc',
              'sphinx.ext.napoleon',
              'sphinx.ext.duration']


autodoc_default_options = {'members': True,
                           'undoc-members': True,
                           'show-inheritance': True,
                           'recursive': True, }


templates_path = ['_templates']


exclude_patterns = []


html_theme = 'furo'


html_theme_options = {"light_css_variables": {"color-brand-primary": "#9e007e",
                                              "color-brand-content": "#00a9e0",
                                              },
                      "dark_css_variables": {"color-brand-primary": "#5c2483",
                                             "color-brand-content": "#2268b1",
                                             },
                      "light_logo": "logo-light-mode.png",
                      "dark_logo": "logo-dark-mode.png",
                      "announcement": "<em>Important</em> Doku befindet sich im Aufbau!",
                      }

html_static_path = ['_static']


pygments_style = "sphinx"
pygments_dark_style = "monokai"


napoleon_google_docstring = True
napoleon_numpy_docstring = True
napoleon_include_init_with_doc = True
napoleon_include_private_with_doc = True
napoleon_include_special_with_doc = True`

As i tried to build with this conf.py this error has been printed:

Configuration error:
This documentation is not using `furo.css` as the stylesheet. If you have set `html_style` in your conf.py file, remove it.

But as you can see, there is no html_style set in my conf.py. I use Poetry to install into my .venv. I cant find any other use of html_style somewhere else in my Project. Can i set the stylesheet in my conf.py? Do you have maybe a hint about my mistake... i guess it is something pretty obvious...

Thanks a lot!

I was able to reproduce this error with Sphinx 7.0.2 and Furo 2023.8.19. I updated sphinx to the latest version (7.2.5) as per this GitHub Issue and that resolved it for me.

It looks like you need to run poetry update for sphinx and furo.