Discord.py - AttributeError: 'NoneType' object has no attribute 'send'

Question

I was casually programming my Discord bot, and when I was done, I went and tested my code (which sends a welcoming message when someone joins the server) by using my alternative account to join the test server. But when the alternative joined, I got this error:

Ignoring exception in on_member_join
Traceback (most recent call last):
  File "C:\Users\quinn\AppData\Local\Programs\Python\Python37\lib\site-packages\discord\client.py", line 343, in _run_event
    await coro(*args, **kwargs)
  File "E:\GrindersValley\ValleysPy\cogs\Hellogoodbye.py", line 36, in on_member_join
    await client.get_channel(844229450928488458).send(embed=embed)
AttributeError: 'NoneType' object has no attribute 'send'\

I have no clue what's wrong. My code: https://pastebin.com/VntL0y5d

Answer 1

First, your issue is that your declaration of client and bot is inconsistent, so change all instances of client to bot .

Second, all calls upon bot inside the cog should be self.bot because you declared that in _init_ as a class variable, so ex: bot.get_channel() should be self.bot.get_channel()

Third, your cache may not be populated so add:

await self.bot.wait_until_ready()

to the beginning of your listeners to ensure your client's cache is fully populated before trying to call on it

Answer 2

TextChannel wasn't found. If the bot can't fetch the channel from its cache then it returns None, which is what's triggering your error.