My mongodb info etc. I entered it correctly, but every time I try to run the code, I keep getting this error. Attached is some of my code and a picture of the error.

error

Source Code

const vars = require("../variables");

const url = vars.dbLink; // vars.dbLink
const dbName = "channels";

var database;

const client = new MongoClient(url, { useNewUrlParser: true, useUnifiedTopology: true });

function connect(callback) {
  MongoClient.connect(url, { useNewUrlParser: true }, (err, res) => {
    const db = res.db(dbName);
    database = db;
    return callback(err);
  });
}