'can't use random in @client.command for discord.py

Hi if anyone could help with this code i want to use response = random.choice(img) in @client.command for discord.py but it keeps giving me error discord.ext.commands.errors.CommandInvokeError: Command raised an exception: TypeError: object of type 'Command' has no len() I don't know how to use random with @client.command please help thanks.

@client.command(pass_context=True)
async def img(ctx):
  embed = discord.Embed(
   title = 'Image',
   description = 'Image',
   colour = discord.Colour.blue()
   )
  response = random.choice(img)
  embed.add_field(name="Image", value=response, inline=False)
  embed.set_footer(text="I love you all <3")
  await ctx.send(embed=embed)


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