问为什么我会得到这个错误？机器人应该用ID=899279907216031744来分配角色，当我给出这种类型的输入时，我得到了错误

EN

import os
import discord
import discord.ext.commands as commands
import dotenv
import random

dotenv.load_dotenv()

bot = commands.Bot(command_prefix='$')

@bot.event
async def on_ready():
    print('I am online')
    print(bot.user.name)
    print(bot.user.id)
    print('-----')

@bot.event
async def on_message(message):
    member = message.author
    role = discord.utils.get(member.guild.roles, id="899279907216031744")
    splits = message.content.split("-")

    # it's not in the wanted format
    if len(splits) != 4:
        # return or something else
        cont = False

    # check if first is a number within range <1, 999>
    try:
        if int(splits[0]) <= 0 and int(splits[0]) >= 1000:
            cont = True
    except ValueError:
        cont = False

    # check if second is one of the options
    if splits[1] not in ["UG", "PG", "D"]:
        cont = False

    # check if third is one of the options
    if splits[2] not in ["CSAI","CSE","ECAI","ECE","IT","MAE","EEE","CE","PD","AE","CH","CE","EE","ME","ED","MV","ER","QT","RAS","AI","CS","CP","BE","CHE","CHEM","CG","CC","VLSI","EV","DES"]:
        cont = False

    # check if fourth is a number from range <2022 ...>
    try:
        if int(splits[3]) <= 2022:
            cont = False
    except ValueError:
        cont = False

    # it fits all the criteria
    if cont:    
        await discord.Member.add_roles(member, role)



bot.run(os.getenv('TOKEN'))