Error in bot.

[DTOG0001]

Traceback (most recent call last):
File "C:\Users\arsto\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\discord\ext\commands\bot.py", line 902, in invoke
await ctx.command.invoke(ctx)
File "C:\Users\arsto\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\discord\ext\commands\core.py", line 856, in invoke
await self.prepare(ctx)
File "C:\Users\arsto\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\discord\ext\commands\core.py", line 790, in prepare
await self._parse_arguments(ctx)
File "C:\Users\arsto\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\discord\ext\commands\core.py", line 697, in _parse_arguments
transformed = await self.transform(ctx, param)
File "C:\Users\arsto\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\discord\ext\commands\core.py", line 552, in transform
return await self.do_conversion(ctx, converter, argument, param)
File "C:\Users\arsto\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\discord\ext\commands\core.py", line 503, in do_conversion
raise BadUnionArgument(param, converter.args, errors)
discord.ext.commands.errors.BadUnionArgument: Could not convert "bot" into Member or User.

None