UnhandledPromiseRejectionWarning when trying to send message - node.js

Question

I am trying to send a message through discord.js and I am getting the following error:
(node:10328) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'send' of undefined
Here is my code:
// Init
const Discord = require("discord.js");
const bot = new Discord.Client();
const channel = bot.users.cache.get('4257');
// Vars
// Code
bot.on("ready", () => {
console.log("The Bot is ready!");
channel.send("Test");
});
// Login
bot.login(" "); // I will hide this.
What is wrong? Is it the id on the channel variable? I just put in the id of my bot since I didn't know what to put in it.
At first I gave it all the permissions under "Text Permissions", but I also tried giving him admin privs. It still didn't work. What am I doing wrong?

Answer 1

The problem is this line:
const channel = bot.users.cache.get('4257');
Here's what's wrong with it:
const channel = bot.users.cache // this returns a collection of users, you want channels.
.get('4257'); // this is a user discriminator, you want a channel ID
Here's how to fix it:
const id = <ID of channel you want to send the message to>
const channel = bot.channels.cache.get(id)
// ...
channel.send('Test')
Here's an example:
const channel = bot.channels.cache.get('699220239698886679')
channel.send('This is the #general channel in my personal Discord')
How to get a Channel ID
ChannelManager Docs

Answer 2

const channel is empty here. You need to make sure value should be assigned in it.
channel.send("Test");
If its not mendatory that value will come then use try-catch.
try {
channel.send("Test");
} catch(e) {
console.log(e)
}
Please support with vote or answered if it helps, thanks.