code blocks without language error with sphinx #3

# rstcheck -r project/docs/source --debug

multiprocessing.pool.RemoteTraceback: 
"""
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/multiprocessing/pool.py", line 125, in worker
    result = (True, func(*args, **kwds))
  File "/usr/local/lib/python3.9/multiprocessing/pool.py", line 48, in mapstar
    return list(map(*args))
  File "/usr/local/lib/python3.9/site-packages/rstcheck.py", line 273, in _check_file
    for error in check(contents,
  File "/usr/local/lib/python3.9/site-packages/rstcheck.py", line 184, in check
    docutils.core.publish_string(
  File "/usr/local/lib/python3.9/site-packages/docutils/core.py", line 407, in publish_string
    output, pub = publish_programmatically(
  File "/usr/local/lib/python3.9/site-packages/docutils/core.py", line 665, in publish_programmatically
    output = pub.publish(enable_exit_status=enable_exit_status)
  File "/usr/local/lib/python3.9/site-packages/docutils/core.py", line 217, in publish
    self.document = self.reader.read(self.source, self.parser,
  File "/usr/local/lib/python3.9/site-packages/docutils/readers/__init__.py", line 72, in read
    self.parse()
  File "/usr/local/lib/python3.9/site-packages/docutils/readers/__init__.py", line 78, in parse
    self.parser.parse(self.input, document)
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/__init__.py", line 183, in parse
    self.statemachine.run(inputlines, document, inliner=self.inliner)
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 170, in run
    results = StateMachineWS.run(self, input_lines, input_offset,
  File "/usr/local/lib/python3.9/site-packages/docutils/statemachine.py", line 239, in run
    context, next_state, result = self.check_line(
  File "/usr/local/lib/python3.9/site-packages/docutils/statemachine.py", line 451, in check_line
    return method(match, context, next_state)
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 3008, in text
    self.section(title.lstrip(), source, style, lineno + 1, messages)
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 327, in section
    self.new_subsection(title, lineno, messages)
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 393, in new_subsection
    newabsoffset = self.nested_parse(
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 281, in nested_parse
    state_machine.run(block, input_offset, memo=self.memo,
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 196, in run
    results = StateMachineWS.run(self, input_lines, input_offset)
  File "/usr/local/lib/python3.9/site-packages/docutils/statemachine.py", line 239, in run
    context, next_state, result = self.check_line(
  File "/usr/local/lib/python3.9/site-packages/docutils/statemachine.py", line 451, in check_line
    return method(match, context, next_state)
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 3008, in text
    self.section(title.lstrip(), source, style, lineno + 1, messages)
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 327, in section
    self.new_subsection(title, lineno, messages)
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 393, in new_subsection
    newabsoffset = self.nested_parse(
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 281, in nested_parse
    state_machine.run(block, input_offset, memo=self.memo,
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 196, in run
    results = StateMachineWS.run(self, input_lines, input_offset)
  File "/usr/local/lib/python3.9/site-packages/docutils/statemachine.py", line 239, in run
    context, next_state, result = self.check_line(
  File "/usr/local/lib/python3.9/site-packages/docutils/statemachine.py", line 451, in check_line
    return method(match, context, next_state)
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 2769, in underline
    self.section(title, source, style, lineno - 1, messages)
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 327, in section
    self.new_subsection(title, lineno, messages)
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 393, in new_subsection
    newabsoffset = self.nested_parse(
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 281, in nested_parse
    state_machine.run(block, input_offset, memo=self.memo,
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 196, in run
    results = StateMachineWS.run(self, input_lines, input_offset)
  File "/usr/local/lib/python3.9/site-packages/docutils/statemachine.py", line 239, in run
    context, next_state, result = self.check_line(
  File "/usr/local/lib/python3.9/site-packages/docutils/statemachine.py", line 451, in check_line
    return method(match, context, next_state)
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 2342, in explicit_markup
    nodelist, blank_finish = self.explicit_construct(match)
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 2354, in explicit_construct
    return method(self, expmatch)
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 2096, in directive
    return self.run_directive(
  File "/usr/local/lib/python3.9/site-packages/docutils/parsers/rst/states.py", line 2146, in run_directive
    result = directive_instance.run()
  File "/usr/local/lib/python3.9/site-packages/sphinx/directives/patches.py", line 180, in run
    node['language'] = self.env.temp_data.get('highlight_language',
  File "/usr/local/lib/python3.9/site-packages/sphinx/util/docutils.py", line 350, in env
    return self.state.document.settings.env
AttributeError: 'Values' object has no attribute 'env'
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/bin/rstcheck", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.9/site-packages/rstcheck.py", line 945, in main
    results = pool.map(
  File "/usr/local/lib/python3.9/multiprocessing/pool.py", line 364, in map
    return self._map_async(func, iterable, mapstar, chunksize).get()
  File "/usr/local/lib/python3.9/multiprocessing/pool.py", line 771, in get
    raise self._value
AttributeError: 'Values' object has no attribute 'env'

# python --version
Python 3.9.10

# pip freeze
alabaster==0.7.12
Babel==2.9.1
certifi==2021.10.8
charset-normalizer==2.0.10
docutils==0.17.1
idna==3.3
imagesize==1.3.0
importlib-metadata==4.11.1
Jinja2==3.0.3
MarkupSafe==2.0.1
packaging==21.3
pockets==0.9.1
Pygments==2.11.2
pyparsing==3.0.6
pytz==2021.3
requests==2.27.1
rstcheck==3.3.1
six==1.16.0
snowballstemmer==2.2.0
Sphinx==4.4.0
sphinx-rtd-theme==1.0.0
sphinxcontrib-applehelp==1.0.2
sphinxcontrib-devhelp==1.0.2
sphinxcontrib-htmlhelp==2.0.0
sphinxcontrib-jsmath==1.0.1
sphinxcontrib-napoleon==0.7
sphinxcontrib-qthelp==1.0.3
sphinxcontrib-serializinghtml==1.1.5
urllib3==1.26.8
zipp==3.7.0