Build Failed!

{'html_theme': 'sphinx_immaterial'}

======================================== stdout ========================================
Running Sphinx v8.2.3
loading translations [en]... locale_dir /home/runner/work/sphinx-themes.org/sphinx-themes.org/sample-docs/locales/en/LC_MESSAGES does not exist
locale_dir /home/runner/work/sphinx-themes.org/sphinx-themes.org/sample-docs/locales/en/LC_MESSAGES does not exist
done
making output directory... done
locale_dir /home/runner/work/sphinx-themes.org/sphinx-themes.org/sample-docs/locales/en/LC_MESSAGES does not exist
loading intersphinx inventory 'sphinx' from https://www.sphinx-doc.org/objects.inv ...
intersphinx inventory has moved: https://www.sphinx-doc.org/objects.inv -> https://www.sphinx-doc.org/en/master/objects.inv

======================================== stderr ========================================

Extension error (sphinx_immaterial.google_fonts)!

Versions
========

* Platform:         linux; (Linux-6.11.0-1018-azure-x86_64-with-glibc2.39)
* Python version:   3.12.3 (CPython)
* Sphinx version:   8.2.3
* Docutils version: 0.21.2
* Jinja2 version:   3.1.6
* Pygments version: 2.19.1

Last Messages
=============

None.

Loaded Extensions
=================

None.

Traceback
=========

    Traceback (most recent call last):
      File "/home/runner/work/sphinx-themes.org/sphinx-themes.org/.nox/publish/lib/python3.12/site-packages/sphinx/events.py", line 404, in emit
        results.append(listener.handler(self.app, *args))
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/runner/work/sphinx-themes.org/sphinx-themes.org/.nox/publish/lib/python3.12/site-packages/sphinx_immaterial/google_fonts.py", line 208, in _builder_inited
        font_options = app.config["html_theme_options"]["font"]
                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^
    KeyError: 'font'
    
    The above exception was the direct cause of the following exception:
    
    Traceback (most recent call last):
      File "/home/runner/work/sphinx-themes.org/sphinx-themes.org/.nox/publish/lib/python3.12/site-packages/sphinx/cmd/build.py", line 414, in build_main
        app = Sphinx(
              ^^^^^^^
      File "/home/runner/work/sphinx-themes.org/sphinx-themes.org/.nox/publish/lib/python3.12/site-packages/sphinx/application.py", line 332, in __init__
        self._init_builder()
      File "/home/runner/work/sphinx-themes.org/sphinx-themes.org/.nox/publish/lib/python3.12/site-packages/sphinx/application.py", line 414, in _init_builder
        self.events.emit('builder-inited')
      File "/home/runner/work/sphinx-themes.org/sphinx-themes.org/.nox/publish/lib/python3.12/site-packages/sphinx/events.py", line 415, in emit
        raise ExtensionError(
    sphinx.errors.ExtensionError: Handler <function _builder_inited at 0x7f318ab0e840> for event 'builder-inited' threw an exception (exception: 'font')


The full traceback has been saved in:
/tmp/sphinx-err-4nshjdb9.log

To report this error to the developers, please open an issue at <https://github.com/sphinx-doc/sphinx/issues/>. Thanks!
Please also report this if it was a user error, so that a better error message can be provided next time.