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discord.ext.commands.errors.CommandInvokeError: Command raised an exception: ValueError: I/O operation on closed file

byMR

January 23, 2022

Hi! I have a separate help command for my discord bot.

class Help(commands.Cog): 
    def __init__(self,client):
        self.client = client
        self.eSantaLogo = discord.File("resources\embedImages\eSanta.png", filename="eSanta.png")

    @commands.group(aliases=["help","commands"], invoke_without_command=True)
    async def help_(self,ctx):
        prefix = ''.join(get_prefix(self.client, ctx))
        embed=discord.Embed(title="eSanta Command Groups",
                            url="https://esanta.me", 
                            color=discord.Color.dark_purple(), 
                            timestamp=datetime.datetime.now(),
                            description=f'Current server prefix: {prefix}')

        embed.set_thumbnail(url='attachment://eSanta.png')
        embed.set_footer(text=f"Requested by {ctx.author.name}")

        embed.add_field(name='**Categories**',value=f"{prefix}help moderator\n{prefix}help fun", inline=True)
        await ctx.send(file=self.eSantaLogo,embed=embed)

def setup(client):
    client.add_cog(Help(client))

When I run it first time it works completly normal.

But when I try to run it again this exception is raised.

Traceback (most recent call last):
  File "C:\Users\notri\AppData\Local\Programs\Python\Python39\lib\site-packages\discord\client.py", line 343, in _run_event
    await coro(*args, **kwargs)
  File "E:\bot\bot.py", line 104, in on_command_error
    raise error
  File "C:\Users\notri\AppData\Local\Programs\Python\Python39\lib\site-packages\discord\ext\commands\bot.py", line 939, in invoke
    await ctx.command.invoke(ctx)
  File "C:\Users\notri\AppData\Local\Programs\Python\Python39\lib\site-packages\discord\ext\commands\core.py", line 1353, in invoke
    await super().invoke(ctx)
  File "C:\Users\notri\AppData\Local\Programs\Python\Python39\lib\site-packages\discord\ext\commands\core.py", line 863, in invoke
    await injected(*ctx.args, **ctx.kwargs)
  File "C:\Users\notri\AppData\Local\Programs\Python\Python39\lib\site-packages\discord\ext\commands\core.py", line 94, in wrapped
    raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: ValueError: I/O operation on closed file

>Solution :

From the documentation:

File objects are single use and are not meant to be reused in multiple abc.Messageable.send()s.

You should reload the file once it’s sent, a pretty solution:

class Help(commands.Cog): 
    def __init__(self,client):
        self.client = client

    @property
    def eSantaLogo(self):
        return discord.File("resources\embedImages\eSanta.png", filename="eSanta.png")

    @commands.group(aliases=["help","commands"], invoke_without_command=True)
    async def help_(self,ctx):
        prefix = ''.join(get_prefix(self.client, ctx))
        embed=discord.Embed(title="eSanta Command Groups",
                            url="https://esanta.me", 
                            color=discord.Color.dark_purple(), 
                            timestamp=datetime.datetime.now(),
                            description=f'Current server prefix: {prefix}')

        embed.set_thumbnail(url='attachment://eSanta.png')
        embed.set_footer(text=f"Requested by {ctx.author.name}")

        embed.add_field(name='**Categories**',value=f"{prefix}help moderator\n{prefix}help fun", inline=True)
        await ctx.send(file=self.eSantaLogo,embed=embed)

def setup(client):
client.add_cog(Help(client))