[ANSWERED] discord.app_commands.errors.MissingApplicationID Error

[Joshisaurio]

Explanation

I had made a bot just to have fun with my friends, and at first it would just detect whenever someone posted a message and replied, and it worked perfectly, but I wanted to add slash commands so of course I researched how to do it. And I'm pretty sure my code was right at that point, but I kept getting the discord.app_commands.errors.MissingApplicationID error whenever I tried to run the code.
Now, here is my code but it probably seems completely broken now since I basically tried everything and kind of broke the whole thing. Just want to note that whenever I remove everything that I added for the commands, it works, but as soon as I add it I get the error, but the bot keeps running anyway (I'm also using Keep_alive on replit but I removed it to save space). I also tried doing the same code for the commands in a separate bot and it worked for some reason. I even checked the intents and I don't think I was missing any, the only one I needed was the message content intent (which I needed for the bot to read the messages and reply) and it was checked already, and I'm pretty sure that the bot doesn't even need it. I hope someone can help!
Edit: I also tried to put the application id in the client constructor but it didn't work. It just kept generating the same thing or an error where it was missing intents. I don't even know what happened anymore or if it was the same error

The code

import discord
from discord import app_commands
from discord.ext import commands
import os

intents = discord.Intents.default()
intents.message_content = True

bot = commands.Bot(command_prefix="!", intents = intents)
client = discord.Client(intents=intents)

@client.event
async def on_ready():
  #print('Logged in as {0.user}'.format(client))
  print('Bot is ready!')
  #try:
  synced = await bot.tree.sync()
  print(f"Synced {len(synced)} command(s)")
  #except Exception as e:
    #print(e)

@client.event
async def on_message(message):
  if message.author == client.user:
      return

  messagecontent = str(message.content).lower()
  
  if "ola" in messagecontent:
        print("ALGUIEN DIJO OLA >:(")
        await message.channel.send('se dice hola :v')
        await message.channel.send('<:picadie:1110627479950987294>')

@bot.tree.command(name="test")
async def test(interaction: discord.Interaction):
  await interaction.response.send_message(f"Hola {interaction.user.mention}, recuerda no decir Ola porque me enojo", ephemeral = True)

try:
  client.run(os.getenv("TOKEN"))
  bot.run(os.getenv("TOKEN"))
except discord.HTTPException as e:
  if e.status == 429:
      print("The Discord servers denied the connection for making too many requests")
      print("Get help from https://stackoverflow.com/questions/66724687/in-discord-py-how-to-solve-the-error-for-toomanyrequests")
  else:
      raise e

The full traceback:

Traceback (most recent call last):
  File "/home/runner/Yet-Another-Random-Bot/venv/lib/python3.8/site-packages/discord/client.py", line 441, in _run_event
    await coro(*args, **kwargs)
  File "main.py", line 23, in on_ready
    synced = await bot.tree.sync()
  File "/home/runner/Yet-Another-Random-Bot/venv/lib/python3.8/site-packages/discord/app_commands/tree.py", line 1055, in sync
    raise MissingApplicationID
discord.app_commands.errors.MissingApplicationID: Client does not have an application_id set. Either the function was called before on_ready was called or application_id was not passed to the Client constructor.

[LostLuma]

Hello, your issue stems from you defining both a Client and Bot instance and mixing them up afterwards. The Bot class is an extension of the Client class, and if you'd like to switch from one to the other to make use of additional functionality in Bot you should replace the Client with a Bot, rather than creating it in addition to the other.

The error specifically occurs because the internal application_id field is filled when the library connects to Discord, and you're syncing the bot's CommandTree within the ready event for the client, rather than the one for your bot. If you only have one of the two as described above your issue should resolve itself 🙂 Do note that the only proper way of fixing this is to only have one of the two, running multiple applications within a single program is not recommended and will likely lead you to even more confusing issues.

[Joshisaurio]

Thanks! I'll try it when I get back to my pc

[Joshisaurio]

This worked! Tysm