[1608] example auth-routes not working

Hello! Not working example nuxtjs version = v1.0.0-rc11

https://nuxtjs.org/examples/auth-routes

const Nuxt = require('nuxt')
const bodyParser = require('body-parser')
const session = require('express-session')
const app = require('express')()

.
.
.
.
const isProd = process.env.NODE_ENV === 'production'
const nuxt = new Nuxt({ dev: !isProd })

             ^

TypeError: Nuxt is not a constructor at Object.<anonymous> (/Users/Documents/Projects/test/server.js:22:14) at Module._compile (module.js:571:32) at Object.Module._extensions..js (module.js:580:10) at Module.load (module.js:488:32) at tryModuleLoad (module.js:447:12) at Function.Module._load (module.js:439:3) at Module.runMain (module.js:605:10) at run (bootstrap_node.js:420:7) at startup (bootstrap_node.js:139

pls - help me - thanks