Не удаётся установить пакет при помощи pip install -> ValueError: source code string cannot contain null bytes

При вводе в консоль:

pip install numpy

Или :

pip install matplotlib

В общем любой библиотеки вылазит вот такая ошибка:

Traceback (most recent call last):
  File "c:\users\pol\appdata\local\programs\python\python39\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\users\pol\appdata\local\programs\python\python39\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Users\Pol\AppData\Local\Programs\Python\Python39\Scripts\pip.exe\__main__.py", line 7, in <module>
  File "c:\users\pol\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\cli\main.py", line 73, in main
    command = create_command(cmd_name, isolated=("--isolated" in cmd_args))
  File "c:\users\pol\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\commands\__init__.py", line 105, in create_command
    module = importlib.import_module(module_path)
  File "c:\users\pol\appdata\local\programs\python\python39\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 790, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "c:\users\pol\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\commands\install.py", line 17, in <module>
    from pip._internal.cli.req_command import RequirementCommand, with_cleanup
  File "c:\users\pol\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\cli\req_command.py", line 18, in <module>
    from pip._internal.index.collector import LinkCollector
  File "c:\users\pol\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\index\collector.py", line 14, in <module>
    from pip._vendor import html5lib, requests
  File "c:\users\pol\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\requests\__init__.py", line 43, in <module>
    from pip._vendor import urllib3
  File "c:\users\pol\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\urllib3\__init__.py", line 11, in <module>
    from . import exceptions
ValueError: source code string cannot contain null bytes

Что-то страшное, что мне делать?