您好，我正在遵循课程节点与React全Web堆栈，我有一个大问题，我不知道为什么它会出现，或从什么是显示.我的终端显示此错误：

req.session.regenerate(function(err) {
               ^ TypeError: req.session.regenerate is not a function

我的代码看起来像是
index.js

const express = require("express");
 const mongoose = require("mongoose"); 
 const cookieSession = require("cookie-session");
 const passport = require("passport"); 
 const keys = require("./config/keys"); 
 require("./models/User");
 require("./services/passport");
 
mongoose.connect(keys.connect_url);

const app = express();

app.use(   cookieSession({
     maxAge: 30 * 24 * 60 * 60 * 1000,
     keys: [keys.cookieKey],   }) ); 
app.use(passport.initialize()); 
app.use(passport.session());

require("./routes/authRoutes")(app);
 
const PORT = process.env.PORT || 5000; 
app.listen(PORT);

passport.js

const passport = require("passport"); 
     const GoogleStrategy = require("passport-google-oauth20").Strategy; 
     const mongoose = require("mongoose");
     const keys = require("../config/keys");
     
     const User = mongoose.model("users");
     
    passport.serializeUser((user, done) => {   done(null, user.id); });
 
    passport.deserializeUser((id, done) => {  
    User.findById(id).then((user) => {
       done(null, user);   }); });
    
    passport.use(new GoogleStrategy(
         {
           clientID: keys.googleClientId,
           clientSecret: keys.googleClientSecret,
           callbackURL: "/auth/google/callback",
         },
         (accessToken, refreshToken, profile, done) => {
           User.findOne({ googleId: profile.id }).then((existingUser) => {
             if (existingUser) {
               // we already have a record with the given profile ID
               done(null, existingUser);
             } else {
               // we don't have a user record with this ID, make a new record!
                new User({ googleId: profile.id })
               .save()
                 .then((user) => done(null, user));
             }
           });
         }   ) );

authRouters.js

const passport = require("passport");
    
    module.exports = (app) => {
      app.get(
        "/auth/google",
        passport.authenticate("google", {
          scope: ["profile", "email"],
        })
      );
    
      app.get("/auth/google/callback", passport.authenticate("google"));
    
      app.get("/api/current_user", (req, res) => {
        res.send(req.user);
      });
    };

我真的不知道这个问题是从哪里来的，我可以说，当我进入localhost:5000/auth/google时，这个问题就出现了