Handlebars: Access has been denied to resolve the property

I am having trouble with this web application. I can enter all the data on the main page but when I enter it doesn’t appear on the list page. When I go into MongoDB the data is being stored. I have attached the server.js file and the petController.js file. I have also attached a few images of what I am seeing. I know it is an issue with the handlebars package, but I can’t seem to figure it out.

**server.js file**

require('./models/db');

const express = require('express');
const path = require('path');
const exphbs = require('express-handlebars');
const hbs = require('express-handlebars');


const petController = require('./controllers/petController');

var app = express();
app.use(express.urlencoded({
    extended: true
}));
app.use(express.json());
app.set('views', path.join(__dirname, '/views/'));
app.engine('handlebars', exphbs.engine({ extname: 'handlebars', defaultLayout:'mainLayout', layoutsDir: __dirname + '/views/layouts/' /*hanldlebars: allowInsecurePrototypeAccess(Handlebars)*/ }));
app.set('view engine','handlebars');

app.listen(3000, () => {
    console.log('Express server started at port : 3000');
});

app.use('/pet', petController);

**petController.js**

const express = require('express');
var router = express.Router();
const mongoose = require('mongoose');
const Pet = mongoose.model('Pet');

router.get('/', (req, res) => {
    res.render("pet/addOrEdit", {
        viewTitle: "Insert Pet"
    });
});

router.post('/', (req, res) => {
    if (req.body._id == '')
        insertRecord(req, res);
        else
        updateRecord(req, res);
});


function insertRecord(req, res) {
    var pet = new Pet();
    pet.petName = req.body.petName;
    pet.breed = req.body.breed;
    pet.age = req.body.age;
    pet.owner = req.body.owner;
    pet.save((err, doc) => {
        if (!err)
            res.redirect('pet/list');
        else {
            if (err.name == 'ValidationError') {
                handleValidationError(err, req.body);
                res.render("pet/addOrEdit", {
                    viewTitle: "Insert Pet",
                    pet: req.body
                });
            }
            else
                console.log('Error during record insertion : ' + err);
        }
    });
}

function updateRecord(req, res) {
    Pet.findOneAndUpdate({ _id: req.body._id }, req.body, { new: true }, (err, doc) => {
        if (!err) { res.redirect('pet/list'); }
        else {
            if (err.name == 'ValidationError') {
                handleValidationError(err, req.body);
                res.render("pet/addOrEdit", {
                    viewTitle: 'Update Pet',
                    employee: req.body
                });
            }
            else
                console.log('Error during record update : ' + err);
        }
    });
}


router.get('/list', (req, res) => {
    Pet.find((err, docs) => {
        if (!err) {
            res.render("pet/list", {
                list: docs
            });
        }
        else {
            console.log('Error in retrieving pet list :' + err);
        }
    });
});


function handleValidationError(err, body) {
    for (field in err.errors) {
        switch (err.errors[field].path) {
            case 'petName':
                body['petNameError'] = err.errors[field].message;
                break;
            case 'breed':
                body['breedError'] = err.errors[field].message;
                break;
            default:
                break;
        }
    }
}

router.get('/:id', (req, res) => {
    Pet.findById(req.params.id, (err, doc) => {
        if (!err) {
            res.render("pet/addOrEdit", {
                viewTitle: "Update Pet",
                pet: doc
            });
        }
    });
});

router.get('/delete/:id', (req, res) => {
    Pet.findByIdAndRemove(req.params.id, (err, doc) => {
        if (!err) {
            res.redirect('/pet/list');
        }
        else { console.log('Error in pet delete :' + err); }
    });
});

module.exports = router;

**Images**
[![enter image description here][1]][1]
[![enter image description here][2]][2]
[![enter image description here][3]][3]
[![enter image description here][4]][4]


  [1]: https://i.stack.imgur.com/NQUWg.png
  [2]: https://i.stack.imgur.com/9ZsCi.png
  [3]: https://i.stack.imgur.com/GVW4Q.png
  [4]: https://i.stack.imgur.com/muC2L.png