Slash command not working

[infinotiver]

I tried this code available in the DOcs

import discord
from discord.ext import commands
from dislash import InteractionClient, Option, OptionType

bot = commands.Bot(command_prefix="!")
inter_client = InteractionClient(bot, test_guilds=[12345])

@inter_client.slash_command(
    description="Shows the avatar of the user",
    options=[
        Option("user", "Enter the user", OptionType.USER)
        # By default, Option is optional
        # Pass required=True to make it a required arg
    ]
)
async def avatar(inter, user=None):
    # If user is None, set it to inter.author
    user = user or inter.author
    # We are guaranteed to receive a discord.User object,
    # because we specified the option type as Type.USER

    emb = discord.Embed(
        title=f"{user}'s avatar",
        color=discord.Color.blue()
    )
    emb.set_image(url=user.avatar_url)
    await inter.reply(embed=emb)
    ```
    But  I didnt got any slash command and when I used it an error came Command not found. I tried it with a new bot too but same error