Error in avatar.

[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 505, in do_conversion
return await self._actual_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 451, in _actual_conversion
ret = await instance.convert(ctx, argument)
File "C:\Users\arsto\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\discord\ext\commands\converter.py", line 250, in convert
raise UserNotFound(argument)
discord.ext.commands.errors.UserNotFound: User "ruvi" not found.

None