'if not "giveaway rig" in str(ctx.command): AttributeError: 'CheckFailure' object has no attribute 'command'` Can you tell how to fix this? - command

Question

This is my code:
#bot.event
async def on_command_error(error, ctx):
if not "giveaway rig" in str(ctx.command):
if isinstance(error, commands.CommandNotFound):
pass
elif isinstance(error, commands.MissingRequiredArgument):
await send_cmd_help(ctx)
elif isinstance(error, commands.BadArgument):
await send_cmd_help(ctx)
else:
await ctx.bot.send_message(ctx.message.channel, defaultGiveawayErrorMessage)
And when it runs, this error shows:
if not "giveaway rig" in str(ctx.command):
AttributeError: 'CheckFailure' object has no attribute 'command'
How can I fix this?

Answer 1

The issue at hand:
You've got your event's parameters the wrong way round.
Swap them around like so:
async def on_command_error(ctx, error):
Discord.py version:
And from the looks of things, you seem to be using some async code:
await ctx.bot.send_message(ctx.message.channel, defaultGiveawayErrorMessage)
which, in rewrite (v1.x), can be written as:
await ctx.send(defaultGiveawayErrorMessage)
The rewrite and async versions of d.py are not compatible, and you will need to update your version of d.py.
You can do this by running:
pip install -U discord.py
and you'll know whether you have the rewrite version judging by if you see this in your output:
Requirement already up-to-date: discord.py in c:\PATH\TO\python\python35\lib\site-packages (1.X.X)
(Note the version number at the end)
Some issues that may arise:
You've got it installed successfully, but running your script errors when using rewrite's documentation.
Cause: This is because you may be trying to run the script on a version of python that discord.py wasn't installed on.
Fixes:
If this was done in a virtual environment, it should be an easy enough fix - just open up the venv's terminal and make sure you run the command there (not in your cmd prompt!).
If you're not using a venv, it'd be your best bet to just make sure you have one version of Python installed.
Whenever you run the command pip install -U discord.py, you're only getting v0.16.x installed.
Cause: You're installing the package on an outdated version of Python.
Fixes:
discord.py, as of this answer, only supports Python versions 3.5.3 and above.
This means that you need to upgrade your version of Python.
If you're still encountering this issue and you're sure you've got a version of 3.5.3 or above, check the current versions of Python that discord.py supports. A nice and simple fix for this is to make sure you only have one version of Python installed again.
And with that being said, I highly recommend using the rewrite docs, and if you want to follow any tutorials, make sure they're up-to-date (include rewrite as a keyword in your searches).
The rewrite version is much, much nicer than async, and at first it may be a bit difficult to get to grips with what's changed, which is what this page is for. It'll help build the foundations for your migration to the newer d.py version.
References:
Major model changes - Moving from async to rewrite, I highly recommend reading through this, as it could fix any issues that you run into when you get started.
OS-specific installations - For if you're still running into issues during installation.
on_command_error()
commands.Context - You will, depending on what your bot does, be using context instances a LOT of the time. Get familiar with what attributes and methods you can access - it'll save you a lot of headaches in the future.