Hello folks,

I'm writing to ask if folks have seen the following argparse errors:

```
# Platform:         linux; (Linux-6.1.0-9-amd64-x86_64-with-glibc2.36)
# Sphinx version:   7.0.1
# Python version:   3.10.12 (CPython)
# Docutils version: 0.20.1
# Jinja2 version:   3.1.2
# Pygments version: 2.15.1

# Last messages:
#   done
#   [autosummary] generating autosummary for: index.rst
#   building [mo]: targets for 0 po files that are out of date
#   writing output...
#   
#   building [coverage]: coverage overview
#   updating environment:
#   [new config]
#   1 added, 0 changed, 0 removed
#   reading sources... [100%] index

# Loaded extensions:
#   sphinx.ext.mathjax (7.0.1)
#   alabaster (0.7.13)
#   sphinxcontrib.applehelp (1.0.4)
#   sphinxcontrib.devhelp (1.0.2)
#   sphinxcontrib.htmlhelp (2.0.1)
#   sphinxcontrib.serializinghtml (1.1.5)
#   sphinxcontrib.qthelp (1.0.3)
#   sphinx.ext.autodoc.preserve_defaults (7.0.1)
#   sphinx.ext.autodoc.type_comment (7.0.1)
#   sphinx.ext.autodoc.typehints (7.0.1)
#   sphinx.ext.autodoc (7.0.1)
#   sphinx.ext.autosummary (7.0.1)
#   numpydoc (1.5.0)
#   sphinx.ext.coverage (7.0.1)
#   sphinxarg.ext (0.2.5)
#   m2r2 (0.3.3.post2)

# Traceback:
Traceback (most recent call last):
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/sphinx/cmd/build.py",
 
line 285, in build_main
    app.build(args.force_all, args.filenames)
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/sphinx/application.py",
 
line 351, in build
    self.builder.build_update()
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/sphinx/builders/__init__.py",
 
line 291, in build_update
    self.build(['__all__'], to_build)
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/sphinx/builders/__init__.py",
 
line 311, in build
    updated_docnames = set(self.read())
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/sphinx/builders/__init__.py",
 
line 418, in read
    self._read_serial(docnames)
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/sphinx/builders/__init__.py",
 
line 439, in _read_serial
    self.read_doc(docname)
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/sphinx/builders/__init__.py",
 
line 495, in read_doc
    publisher.publish()
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/docutils/core.py",
 
line 234, in publish
    self.document = self.reader.read(self.source, self.parser,
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/sphinx/io.py", 
line 104, in read
    self.parse()
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/docutils/readers/__init__.py",
 
line 76, in parse
    self.parser.parse(self.input, document)
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/sphinx/parsers.py",
 
line 80, in parse
    self.statemachine.run(inputlines, document, inliner=self.inliner)
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/docutils/parsers/rst/states.py",
 
line 169, in run
    results = StateMachineWS.run(self, input_lines, input_offset,
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/docutils/statemachine.py",
 
line 233, in run
    context, next_state, result = self.check_line(
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/docutils/statemachine.py",
 
line 445, in check_line
    return method(match, context, next_state)
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/docutils/parsers/rst/states.py",
 
line 2785, in underline
    self.section(title, source, style, lineno - 1, messages)
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/docutils/parsers/rst/states.py",
 
line 325, in section
    self.new_subsection(title, lineno, messages)
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/docutils/parsers/rst/states.py",
 
line 391, in new_subsection
    newabsoffset = self.nested_parse(
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/docutils/parsers/rst/states.py",
 
line 279, in nested_parse
    state_machine.run(block, input_offset, memo=self.memo,
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/docutils/parsers/rst/states.py",
 
line 195, in run
    results = StateMachineWS.run(self, input_lines, input_offset)
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/docutils/statemachine.py",
 
line 233, in run
    context, next_state, result = self.check_line(
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/docutils/statemachine.py",
 
line 445, in check_line
    return method(match, context, next_state)
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/docutils/parsers/rst/states.py",
 
line 2355, in explicit_markup
    nodelist, blank_finish = self.explicit_construct(match)
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/docutils/parsers/rst/states.py",
 
line 2367, in explicit_construct
    return method(self, expmatch)
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/docutils/parsers/rst/states.py",
 
line 2104, in directive
    return self.run_directive(
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/docutils/parsers/rst/states.py",
 
line 2154, in run_directive
    result = directive_instance.run()
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/sphinxarg/ext.py",
 
line 464, in run
    f = self._open_filename()
  File 
"/home/boyan/miniconda3/envs/py310/lib/python3.10/site-packages/sphinxarg/ext.py",
 
line 448, in _open_filename
    return open(shutil.which(self.options['filename']))
TypeError: expected str, bytes or os.PathLike object, not NoneType

```

Anybody have a suggestion here?

Cheers!

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