为 discord.js v12 创建一个自动角色

I wanna make my bot give automatically role when my friends join for first time to my server: I have tried this one my VPS node version: 12.19.0v:?

client.on('guildMemberAdd', member => {
console.log('User @' + member.user.tag + ' has joined the server!');
var role = member.guild.roles.cache.find(role => role.name == "Newbie")
let user = member.user
user.roles.add(role);
});

但没有任何效果！请帮帮我