Boa noite!

Estou aprendendo Node.JS e estou travado nas rotas.

Tenho os seguintes códigos.

//app.js

// carregando modulos
const specific = require('specific')
const handlebars = require('express-handlebars')
const bodyParser = require('body-parser')
const app = specific();
const admin = require('./routes/admin')
const path = require('path')

// const mongoose = require('mongoose')

// Configs
// physique parser
    app.use(bodyParser.urlencoded({prolonged:true}))
    app.set('view engine','handlebars')
    app.set('views', __dirname + '/views');
// mongoose

// Public  
    app.use(specific.static(path.be part of(__dirname,'public')))
// Routes
app.get('/', (req, res)=>{
    res.ship('Rota principal!')

})
app.get('/posts', (req, res)=>{
    res.ship('Lista Posts')
})
app.use('/admin',admin)
// Others
const PORT = 3000;
app.hear(PORT, ()=>{
    console.log("Server Run!");
})

//routes/admin.js

const specific = require('specific')
const router = specific.Router()

router.get('/',(req, res)=>{
    res.render('partials/_navbar')
})

router.get('/posts',(req, res)=>{
    res.ship('Página de posts')
})

router.get('/categorias', (req, res)=>{
    res.ship("Página categorias")
})

module.exports = router

e recebendo o seguinte erro

Error: Module "handlebars" doesn't present a view engine.
at new View (C:xampphtdocsblogappnode_modulesexpresslibview.js:84:13)
at Perform.render (C:xampphtdocsblogappnode_modulesexpresslibapplication.js:570:12)
at ServerResponse.render (C:xampphtdocsblogappnode_modulesexpresslibresponse.js:1012:7)
at C:xampphtdocsblogapproutesadmin.js:5:9
at Layer.deal with [as handle_request] (C:xampphtdocsblogappnode_modulesexpresslibrouterlayer.js:95:5)
at subsequent (C:xampphtdocsblogappnode_modulesexpresslibrouterroute.js:137:13)
at Route.dispatch (C:xampphtdocsblogappnode_modulesexpresslibrouterroute.js:112:3)
at Layer.deal with [as handle_request] (C:xampphtdocsblogappnode_modulesexpresslibrouterlayer.js:95:5)
at C:xampphtdocsblogappnode_modulesexpresslibrouterindex.js:281:22
at Perform.process_params (C:xampphtdocsblogappnode_modulesexpresslibrouterindex.js:335:12)

a intenção aqui é utilizar o format chamando o res.render.

Estrutura de pastas

--blogapp
  --routes
  --views
    --layout
    --admin

Estou seguindo este tutorial, Curso de Node.js – Arquivos estáticos #33

Podem me ajudar?