Django- ValueError: source code string cannot contain null bytes

In the django project, everything was working fine, but when I created .env file and imported variables from .env to settings.py, it started to show this error.

Traceback (most recent call last):
  File "F:\django\udemyProject\siddthoughts\manage.py", line 22, in <module>
    main()
  File "F:\django\udemyProject\siddthoughts\manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "F:\django\udemyProject\venv\lib\site-packages\django\core\management\__init__.py", line 446, in execute_from_command_line
    utility.execute()
  File "F:\django\udemyProject\venv\lib\site-packages\django\core\management\__init__.py", line 386, in execute
    settings.INSTALLED_APPS
  File "F:\django\udemyProject\venv\lib\site-packages\django\conf\__init__.py", line 92, in __getattr__
    self._setup(name)
  File "F:\django\udemyProject\venv\lib\site-packages\django\conf\__init__.py", line 79, in _setup
    self._wrapped = Settings(settings_module)
  File "F:\django\udemyProject\venv\lib\site-packages\django\conf\__init__.py", line 190, in __init__
    mod = importlib.import_module(self.SETTINGS_MODULE)
  File "C:\Python\Python310\lib\importlib\__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "F:\django\udemyProject\siddthoughts\siddthoughts\settings.py", line 15, in <module>
    import environ
  File "F:\django\udemyProject\venv\lib\site-packages\environ\__init__.py", line 18, in <module>
    from .environ import *
  File "F:\django\udemyProject\venv\lib\site-packages\environ\environ.py", line 38, in <module>
    from .fileaware_mapping import FileAwareMapping
ValueError: source code string cannot contain null bytes

All files are showing UTF8 in vs code and I am in my same project's virtual environment and using python interpreter from it only.

can somebody tell me what exactly is happening and how to resolve it.

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