Implementation of Social Authentication(help)

when trying to pass this challenge.
I keep getting these errors.
can someone please help me. 
url.js:154
throw new ERR_INVALID_ARG_TYPE('url', 'string', url);

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^

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TypeError [ERR_INVALID_ARG_TYPE]: The "url" argument must be of type string. Received type undefined

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at Url.parse (url.js:154:11)

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at Object.urlParse [as parse] (url.js:148:13)

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at module.exports (/rbd/pnpm-volume/8241f17e-5cea-44cc-b330-82fd67def16f/node_modules/.registry.npmjs.org/mongodb/2.2.36/node_modules/mongodb/lib/url_parser.js:13:23)

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at connect (/rbd/pnpm-volume/8241f17e-5cea-44cc-b330-82fd67def16f/node_modules/.registry.npmjs.org/mongodb/2.2.36/node_modules/mongodb/lib/mongo_client.js:485:3)

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at Function.MongoClient.connect (/rbd/pnpm-volume/8241f17e-5cea-44cc-b330-82fd67def16f/node_modules/.registry.npmjs.org/mongodb/2.2.36/node_modules/mongodb/lib/mongo_client.js:250:3)

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Jump Toat Object.<anonymous> (/app/server.js:20:7)

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at Module._compile (internal/modules/cjs/loader.js:701:30)

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at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)

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at Module.load (internal/modules/cjs/loader.js:600:32)

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at tryModuleLoad (internal/modules/cjs/loader.js:539:12)

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6s ago

url.js:154

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throw new ERR_INVALID_ARG_TYPE('url', 'string', url);

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^

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TypeError [ERR_INVALID_ARG_TYPE]: The "url" argument must be of type string. Received type undefined

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at Url.parse (url.js:154:11)

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at Object.urlParse [as parse] (url.js:148:13)

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at module.exports (/rbd/pnpm-volume/8241f17e-5cea-44cc-b330-82fd67def16f/node_modules/.registry.npmjs.org/mongodb/2.2.36/node_modules/mongodb/lib/url_parser.js:13:23)

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at connect (/rbd/pnpm-volume/8241f17e-5cea-44cc-b330-82fd67def16f/node_modules/.registry.npmjs.org/mongodb/2.2.36/node_modules/mongodb/lib/mongo_client.js:485:3)

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at Function.MongoClient.connect (/rbd/pnpm-volume/8241f17e-5cea-44cc-b330-82fd67def16f/node_modules/.registry.npmjs.org/mongodb/2.2.36/node_modules/mongodb/lib/mongo_client.js:250:3)

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Jump Toat Object.<anonymous> (/app/server.js:20:7)

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at Module._compile (internal/modules/cjs/loader.js:701:30)

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at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)

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at Module.load (internal/modules/cjs/loader.js:600:32)

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at tryModuleLoad (internal/modules/cjs/loader.js:539:12)

// running testsTimeout has occurredTimeout has occurred// tests completed
// running tests
Timeout has occurred
Timeout has occurred
// tests completed

X Route /auth/github correct
X Route /auth/github/callback correct
server.js code

'use strict';

const express     = require('express');
const bodyParser  = require('body-parser');
const fccTesting  = require('./freeCodeCamp/fcctesting.js');
const session     = require('express-session');
const mongo       = require('mongodb').MongoClient;
const passport    = require('passport');

const app = express();

fccTesting(app); 

app.use('/public', express.static(process.cwd() + '/public'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

app.set('view engine', 'pug')

mongo.connect(process.env.DATABASE, (err, db) => {
    if(err) {
        console.log('Database error: ' + err);
    } else {
        console.log('Successful database connection');
      
        app.use(session({
          secret: process.env.SESSION_SECRET,
          resave: true,
          saveUninitialized: true,
        }));
        app.use(passport.initialize());
        app.use(passport.session());
      
        function ensureAuthenticated(req, res, next) {
          if (req.isAuthenticated()) {
              return next();
          }
          res.redirect('/');
        };

        passport.serializeUser((user, done) => {
          done(null, user.id);
        });

        passport.deserializeUser((id, done) => {
            db.collection('socialusers').findOne(
                {id: id},
                (err, doc) => {
                    done(null, doc);
                }
            );
        });

      
        /*
        *  ADD YOUR CODE BELOW
        */
      
      
      
      
          app.route('/auth/github')
          .get(passport.authenticate('github'));
      
        app.route('/auth/github/callback')
          .get(passport.authenticate('github', { failureRedirect: '/' }), (req,res) => {
              res.redirect('/profile');
          });
        /*
        *  ADD YOUR CODE ABOVE
        */
      
      
        app.route('/')
          .get((req, res) => {
            res.render(process.cwd() + '/views/pug/index');
          });

        app.route('/profile')
          .get(ensureAuthenticated, (req, res) => {
               res.render(process.cwd() + '/views/pug/profile', {user: req.user});
          });

        app.route('/logout')
          .get((req, res) => {
              req.logout();
              res.redirect('/');
          });

        app.use((req, res, next) => {
          res.status(404)
            .type('text')
            .send('Not Found');
        });
      
        app.listen(process.env.PORT || 3000, () => {
          console.log("Listening on port " + process.env.PORT);
        });  
}});

Hi! I have experienced the same problem.
You should do the following:

  1. in package.json add a “dotenv” package to your dependencies, like this:
"dependencies": {
		...
    "dotenv": "^8.2.0"
}
  1. In your server.js require the package at the top of the file, like this:
const dotenv = require('dotenv');
dotenv.config();

This solved the problem for me!

P.S. Also don’t forget to add to your .env file following variables: GITHUB_CLIENT_ID, GITHUB_CLIENT_SECRET, DATABASE, SESSION_SECRET