Discord bot .js TypeError

const Discord = require('discord.js');

const client = new Discord.Client();

const guild = new Discord.Guild(client, Object);

module.exports = {
    name: 'martinsimp',
    description: "Přejmenuje Martina",
    execute(message, args) {

        message.guild.members.get("689801854666014748").setNickname("LMAO");
        message.channel.send("debug");

    }
};

TypeError: message.guild.members.get is not a function