为什么在运行discord.py代码时出现错误？

ModuleNotFoundError: No module named 'discord'

pip install discord.py

discord.ext.commands.errors.NoPrivateMessage: You cannot use this command in private message channels.

discord.ext.commands.errors.CommandNotFound: Command "yourcommand" is not found

@client.command()
async def yourcommand(ctx):
    await ctx.send('Hello!')

discord.ext.commands.errors.MissingPermissions: You do not have the required permissions to use this command.

aiohttp.client_exceptions.ClientConnectorError: Cannot connect to host discord.com:443 ssl:default [Connect call failed ('192.168.1.1', 443)]

import discord
from discord.ext import commands

client = commands.Bot(command_prefix='!')

@client.command()
async def hello(ctx):
    await ctx.send('Hello!')

client.run('YOUR_TOKEN')