This error message is indicating that an AttributeError occurred in the file "/home/pi/Swimbot/whois.py" on line 294. Specifically, the error is that a 'NoneType' object (an object that does not have a value) does not have an attribute called 'avatar_url'.

It seems the code is trying to access the avatar_url attribute of a discord member object. But the object returned by ctx.message.guild.get_member(ctx.message.author.id) is None, so it cannot access the attribute.

It is likely that the member is not found in the guild, and thus ctx.message.guild.get_member(ctx.message.author.id) return None.
You should check the code before this line and make sure the member exists in the guild before trying to access its avatar_url.

According to CHatGPT.

Just playing...
Greetings, MrLunk