Why do I keep getting this error when trying to set up passport-local-mongoose, after registering a user? - authentication

Question

Every time i try to register a new username and password i get this error. Error Message Im not sure if I am doing something wrong. I am trying to learn the different levels of authentication
my code is below
require('dotenv').config();
const express = require("express");
const bodyParser = require("body-parser");
const ejs = require("ejs");
const mongoose = require("mongoose");
const session = require('express-session');
const passport = require("passport");
const passportLocalMongoose = require("passport-local-mongoose");
const app = express();
app.use(express.static("public"));
app.set('view engine', 'ejs',);
app.use(bodyParser.urlencoded({
extended: true
}));
app.use(session({
secret: 'suckbigd please',
resave: false,
saveUninitialized: true,
cookie: { secure: true }
}));
app.use(passport.initialize());
app.use(passport.session());
mongoose.connect("mongodb://localhost:27017/userDB", { useNewUrlParser: true });
// mongoose.set("useCreateIndex", true);
const userSchema = new mongoose.Schema({
email: String,
password: String
});
userSchema.plugin(passportLocalMongoose);
const User = new mongoose.model("User", userSchema);
passport.use(User.createStrategy());
passport.serializeUser(User.serializeUser());
passport.deserializeUser(User.deserializeUser());
app.get("/", function (req, res) {
res.render("home");
});
app.get("/login", function (req, res) {
res.render("login");
});
app.get("/register", function (req, res) {
res.render("register");
});
app.get("/secrets", function (req, res) {
if (req.isAuthenticated()) {
res.render("secrets");
} else {
res.render("/login");
}
});
app.post("/register", function (req, res) {
User.register({ username: req.body.username }, req.body.password, function (err, user) {
if (err) {
console.log(err);
res.redirect("/register");
} else {
passport.authenticate("local")(req, res, function () {
res.redirect("/secrets");
});
}
});
});
app.post("/login", function (req, res) {
const usetr = new User({
username: req.body.username,
password: req.body.password
});
req.login(user, function (err) {
if (err) {
console.log(err);
} else {
passport.authenticate("local")(req, res, function () {
res.redirect("/secrets");
});
}
})
});
app.listen(3000, function () {
console.log("Server started on port 3000.");
});
I thought I followed the course instructions right. I even watched the video and followed along but I am still getting this error. I am banging my head on the key board. I have been trying to fix this for 4 days now and still nothing. Someone please help.