C:\pwb\GIT\core>generate_user_files

Traceback (most recent call last):
  File "C:\pwb\GIT\core\pwb.py", line 399, in <module>
    if not main():
  File "C:\pwb\GIT\core\pwb.py", line 391, in main
    run_python_file(filename,
  File "C:\pwb\GIT\core\pwb.py", line 106, in run_python_file
    exec(compile(source, filename, 'exec', dont_inherit=True),
  File ".\generate_user_files.py", line 451, in <module>
    main()
  File ".\generate_user_files.py", line 421, in main
    local_args = pywikibot.handle_args(args)
  File "C:\pwb\GIT\core\pywikibot\bot.py", line 907, in handle_args
    init_handlers()
  File "C:\pwb\GIT\core\pywikibot\bot.py", line 373, in init_handlers
    throttle = pywikibot.Site().throttle  # initialize a Throttle obj
  File "C:\pwb\GIT\core\pywikibot\tools\_deprecate.py", line 404, in wrapper
    return obj(*__args, **__kw)
  File "C:\pwb\GIT\core\pywikibot\__init__.py", line 1201, in Site
    _sites[key] = interface(code=code, fam=fam, user=user)
  File "C:\pwb\GIT\core\pywikibot\tools\_deprecate.py", line 487, in wrapper
    return obj(*new_args, **new_kwargs)
  File "C:\pwb\GIT\core\pywikibot\site\_apisite.py", line 115, in __init__
    super().__init__(code, fam, user)
  File "C:\pwb\GIT\core\pywikibot\tools\_deprecate.py", line 487, in wrapper
    return obj(*new_args, **new_kwargs)
  File "C:\pwb\GIT\core\pywikibot\site\_basesite.py", line 48, in __init__
    if code.lower() != code:
AttributeError: 'NoneType' object has no attribute 'lower'
CRITICAL: Exiting due to uncaught exception <class 'AttributeError'>

C:\pwb\GIT\core>