Discord.js Missing permissions error when assign role - discord.js

Question

if (message.content.startsWith("_mute")) {
if (!message.member.hasPermission("ADMINISTRATOR")) {
return message.reply("You don't have permission to do this.");
}
if (message.mentions.users.size === 0) {
return message.reply("Usage: `_mute [mention]`");
}
var muteRole = message.guild.roles.cache.find(r => r.name === "mute");
if (typeof muteRole === "undefined") {
return message.reply("Your server doesn't have `mute` role!");
}
message.mentions.members.forEach((member) => {
member.roles.add(muteRole).then((value) => {
message.reply("Succeed to mute " + member.nickname + ".");
}).catch((error) => {
message.reply("Internal bot error");
console.error(error);
});
});
}
I got this error when I tried to assign role to user.
I set up bot's permission number to '1409286326'
Is there anything else I need to do?
Permission

Answer 1

Try using this permission number: 1475677686
It's probably because you were missing some important permissions such as READ_MESSAGES, SEND_MESSAGES and others. Also, your code might need a little revision, undefined is not a string. Try the code below and the suggested permission number:
if (message.content.startsWith("_mute")) {
if (!message.member.hasPermission("ADMINISTRATOR")) {
return message.reply("You don't have permission to do this.");
}
if (!message.mentions.users.array().length) {
return message.reply("Usage: `_mute [mention]`");
}
var muteRole = message.guild.roles.cache.find(r => r.name === "mute");
if (!muteRole) {
return message.reply("Your server doesn't have `mute` role!");
}
message.mentions.members.forEach((member) => {
member.roles.add(muteRole).then((value) => {
message.reply("Succeed to mute " + member.nickname + ".");
}).catch((error) => {
message.reply("Internal bot error");
console.error(error);
});
});
}