client.guilds.find不是一个函数

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 === '!server') {
    const guild = client.guilds.cache.find(guild => guild.id === message.guild.id);
    if (guild) {
      message.channel.send(`Server name: ${guild.name}`);
    } else {
      message.channel.send('Unable to find server');
    }
  }
});

client.login('your-token-goes-here');