您好，我在get命令/定义中出错，因为它说get命令代码是：

const Discord = require('discord.js');
const client = new Discord.Client({ partials: ["MESSAGE", "CHANNEL", "REACTION" ]});
const prefix = '.';

const fs = require('fs');

client.commands = new Discord.Collection();

const commandFiles = fs.readdirSync('./commands').filter(file => file.endsWith('.js'))
for(const file of commandFiles){
    const command = require(`./commands/${file}`);

    client.commands.set(command.name, command);
}

client.once('ready', () => {
    console.log('Bot is online');
})

client.on('message', message =>{
    if(!message.content.startsWith(prefix) || message.author.bot) return;

    const args = message.content.slice(prefix.length).split(/ +/);
    const command = args.shift().toLowerCase();

    if(command === 'embed'){
      client.command.get('embed').execute(message, args, Discord)
    }
}),

有人能帮我使用未定义的get命令吗？