如何在discord.js的v12中修复我的成员计数

npm install discord.js@12

const Discord = require('discord.js');
const client = new Discord.Client();

client.on('ready', () => {
  console.log(`Logged in as ${client.user.tag}`);
});

client.on('message', message => {
  if (message.content === '!membercount') {
    const memberCount = message.guild.memberCount;
    message.channel.send(`当前服务器成员数量为：${memberCount}`);
  }
});

client.login('YOUR_DISCORD_BOT_TOKEN');