Swimbot Error

Traceback (most recent call last):
  File "C:\Users\swimm\AppData\Local\Programs\Python\Python37\lib\site-packages\discord\ext\commands\bot.py", line 607, in _load_from_module_spec
    spec.loader.exec_module(lib)
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "c:\Users\swimm\OneDrive\Desktop\Swimbot\premium.py", line 252, in <module>
    class PremiumAdminCog(commands.Cog,name="Premium Features Admin"):
  File "c:\Users\swimm\OneDrive\Desktop\Swimbot\premium.py", line 270, in PremiumAdminCog
    @premium.group()
AttributeError: 'Command' object has no attribute 'group'

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

Traceback (most recent call last):
  File "c:\Users\swimm\OneDrive\Desktop\Swimbot\SwimBot.py", line 35, in load
    bot.load_extension(extension_name)
  File "C:\Users\swimm\AppData\Local\Programs\Python\Python37\lib\site-packages\discord\ext\commands\bot.py", line 664, in load_extension
    self._load_from_module_spec(spec, name)
  File "C:\Users\swimm\AppData\Local\Programs\Python\Python37\lib\site-packages\discord\ext\commands\bot.py", line 610, in _load_from_module_spec
    raise errors.ExtensionFailed(key, e) from e
discord.ext.commands.errors.ExtensionFailed: Extension 'premium' raised an error: AttributeError: 'Command' object has no attribute 'group'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\swimm\AppData\Local\Programs\Python\Python37\lib\site-packages\discord\ext\commands\core.py", line 85, in wrapped
    ret = await coro(*args, **kwargs)
  File "c:\Users\swimm\OneDrive\Desktop\Swimbot\SwimBot.py", line 47, in load
    # traceback.print_exception(type(error), error, error.__traceback__)
NameError: name 'error' is not defined