'Problem installing my own package in Editable mode

I try to install my own package by using the command: pip install -e . but I get a very long error message which is attached at the end.
I tried to run the code on vscode and pycharm but the problem remains the same.
I started the package on a first computer which versions are:
setuptools: 59.5.0 pip: 21.3.1 python: 3.9
On the second computer I had this problem.
Its versions are:
setuptools: 58.1.0 pip: 21.2.4 python: 3.9
Then I tried on a fresh third computer with the same files and it worked just fine, versions: setuptools: 47.1.0 pip: 20.1.1 python: 3.8
I'm attaching the relevant files that might be helpful in order to understand the issue.
The OS of all the computers is Windows, but the first and third are English version and the second computer is not. I think that maybe it is the problem, but I'm not sure and have no idea how to fix this if it is indeed the case here

setup.py:

from setuptools import setup

if __name__ == "__main__":
    setup()

setup.cfg:

[metadata]
name=Mice
version=0.0.1
author=J. Random Hacker
[email protected]

[options]
packages=mice
install_requires=
    typing_extensions >= 4.0.1

python_requires = >=3.6
package_dir =
    =src
long_description=open('README.txt').read()

[options.extras_require]
testing =
    pytest>=6.0

[options.package_data]
mice = py.typed

[flake8]
max-line-length=180

ignore=
    F401 # A module has been imported but is not used anywhere in the file.
    E302 # Two blank lines are expected between functions and classes.

The full error I'm getting is:

(myenv) D:\local_github\Mice>pip install -e .
Obtaining file:///D:/local_github/Mice
ERROR: Exception:
Traceback (most recent call last):
  File "D:\local_github\Mice\myenv\lib\site-packages\pip\_internal\cli\base_command.py", line 173, in _main
    status = self.run(options, args)
  File "D:\local_github\Mice\myenv\lib\site-packages\pip\_internal\cli\req_command.py", line 203, in wrapper
    return func(self, options, args)
  File "D:\local_github\Mice\myenv\lib\site-packages\pip\_internal\commands\install.py", line 315, in run
    requirement_set = resolver.resolve(
  File "D:\local_github\Mice\myenv\lib\site-packages\pip\_internal\resolution\resolvelib\resolver.py", line 75, in resolve
    collected = self.factory.collect_root_requirements(root_reqs)
  File "D:\local_github\Mice\myenv\lib\site-packages\pip\_internal\resolution\resolvelib\factory.py", line 471, in collect_root_requirements
    req = self._make_requirement_from_install_req(
  File "D:\local_github\Mice\myenv\lib\site-packages\pip\_internal\resolution\resolvelib\factory.py", line 433, in _make_requirement_from_install_req
    cand = self._make_candidate_from_link(
  File "D:\local_github\Mice\myenv\lib\site-packages\pip\_internal\resolution\resolvelib\factory.py", line 189, in _make_candidate_from_link
    self._editable_candidate_cache[link] = EditableCandidate(
  File "D:\local_github\Mice\myenv\lib\site-packages\pip\_internal\resolution\resolvelib\candidates.py", line 321, in __init__
    super().__init__(
  File "D:\local_github\Mice\myenv\lib\site-packages\pip\_internal\resolution\resolvelib\candidates.py", line 156, in __init__
    self.dist = self._prepare()
  File "D:\local_github\Mice\myenv\lib\site-packages\pip\_internal\resolution\resolvelib\candidates.py", line 227, in _prepare
    dist = self._prepare_distribution()
  File "D:\local_github\Mice\myenv\lib\site-packages\pip\_internal\resolution\resolvelib\candidates.py", line 331, in _prepare_distribution
    return self._factory.preparer.prepare_editable_requirement(self._ireq)
  File "D:\local_github\Mice\myenv\lib\site-packages\pip\_internal\operations\prepare.py", line 622, in prepare_editable_requirement
    dist = _get_prepared_distribution(
  File "D:\local_github\Mice\myenv\lib\site-packages\pip\_internal\operations\prepare.py", line 60, in _get_prepared_distribution
    abstract_dist.prepare_distribution_metadata(finder, build_isolation)
  File "D:\local_github\Mice\myenv\lib\site-packages\pip\_internal\distributions\sdist.py", line 34, in prepare_distribution_metadata
    self._setup_isolation(finder)
  File "D:\local_github\Mice\myenv\lib\site-packages\pip\_internal\distributions\sdist.py", line 61, in _setup_isolation
    self.req.build_env = BuildEnvironment()
  File "D:\local_github\Mice\myenv\lib\site-packages\pip\_internal\build_env.py", line 103, in __init__
    fp.write(textwrap.dedent(
  File "D:\yohai_new\python_folder\Python\Python39\lib\encodings\cp1252.py", line 19, in encode
    return codecs.charmap_encode(input,self.errors,encoding_table)[0]
UnicodeEncodeError: 'charmap' codec can't encode characters in position 589-591: character maps to <undefined>

Solution 1:^[1]

The long_description key of setup.cfg is in the wrong section and its value is not valid.

It should be in the [metadata] section (not in [options]) and it should something like the following:

[metadata]
# ...
long_description = file: README.txt
long_description_content_type = text/plain

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'Problem installing my own package in Editable mode

Solution 1:[1]

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Solution 1:^[1]