Cannot add a role, Discord.js - node.js

Question

so i'm coding a discord bot, and there's a command, this command know when the user changes is custom status, and if the special status is "hello" the bot will send a message in a specific channel, and add a role to the user. But the code gives my an error
Here's the code :
bot.on('presenceUpdate', (oldMember, newMember) => {
console.log(newMember.activities[0].state)
let guildChannels = newMember.guild.channels;
var Cha = guildChannels.cache.find(channel => channel.name === "general")
if(newMember.activities[0].state === "hello") {
Cha.send('hello !')
.then(msg => {
let GradeUser = bot.users.cache.find(user => user.id == newMember.userID);
let role = msg.guild.roles.cache.find(r => r.id == "742423876004216883");
GradeUser.roles.add('742423876004216883')
})
.catch(console.error)
}
});
And here's the error :
TypeError: Cannot read property 'add' of undefined
at C:\Users\Nathan\Desktop\Dev\Effectivement Bot\index.js:320:29
at processTicksAndRejections (internal/process/task_queues.js:93:5)
I just want to solve the error with the role ( add the role )

Answer 1

You need to use a GuildMember object, not a user object.
From discord.js guide
What is the difference between a User and a GuildMember?
A lot of users get confused as to what the difference between Users and GuildMembers is. The simple answer is that a User represents a global Discord user and a GuildMember represents a Discord user on a specific server. That means only GuildMembers can have permissions, roles, and nicknames, for example, because all of these things are server-bound information that could be different on each server that user is in.
Replace bot.users.cache.find() with msg.guild.members.cache.find()