不能運行的Node.js應用程序，因爲：「在失敗views目錄查找視圖‘錯誤’」

Question

我做下面的教程：

https://www.raymondcamden.com/2017/02/08/using-social-login-with-passport-and-node/

然後，我一直在創造這個項目（我「M使用Windows 10）：

> mkdir stackoverflow-question 
> cd stackoverflow-question 
> git clone https://github.com/napolev/stackoverflow-question.git . 
> npm install 
> gulp start-mongod 
> Ctrl+C 
> gulp run 

但是，要在瀏覽器中打開網站時：http://localhost:4000/

我得到的弗洛翼錯誤：

Error: Failed to lookup view "error" in views directory "D:\wamp64\www\ionic2\stackoverflow-question\views" 
    at EventEmitter.render (D:\wamp64\www\ionic2\stackoverflow-question\node_modules\express\lib\application.js:580:17) 
    at ServerResponse.render (D:\wamp64\www\ionic2\stackoverflow-question\node_modules\express\lib\response.js:971:7) 
    at D:\wamp64\www\ionic2\stackoverflow-question\app.js:153:9 
    at Layer.handle_error (D:\wamp64\www\ionic2\stackoverflow-question\node_modules\express\lib\router\layer.js:71:5) 
    at trim_prefix (D:\wamp64\www\ionic2\stackoverflow-question\node_modules\express\lib\router\index.js:315:13) 
    at D:\wamp64\www\ionic2\stackoverflow-question\node_modules\express\lib\router\index.js:284:7 
    at Function.process_params (D:\wamp64\www\ionic2\stackoverflow-question\node_modules\express\lib\router\index.js:335:12) 
    at IncomingMessage.next (D:\wamp64\www\ionic2\stackoverflow-question\node_modules\express\lib\router\index.js:275:10) 
    at done (D:\wamp64\www\ionic2\stackoverflow-question\node_modules\express\lib\response.js:966:25) 
    at EventEmitter.render (D:\wamp64\www\ionic2\stackoverflow-question\node_modules\express\lib\application.js:582:14) 
    at ServerResponse.render (D:\wamp64\www\ionic2\stackoverflow-question\node_modules\express\lib\response.js:971:7) 
    at D:\wamp64\www\ionic2\stackoverflow-question\app.js:127:9 
    at Layer.handle [as handle_request] (D:\wamp64\www\ionic2\stackoverflow-question\node_modules\express\lib\router\layer.js:95:5) 
    at next (D:\wamp64\www\ionic2\stackoverflow-question\node_modules\express\lib\router\route.js:137:13) 
    at isLoggedIn (D:\wamp64\www\ionic2\stackoverflow-question\app.js:123:5) 
    at Layer.handle [as handle_request] (D:\wamp64\www\ionic2\stackoverflow-question\node_modules\express\lib\router\layer.js:95:5) 

這是該文件的源代碼：app.js：

var express = require('express'); 
var exphbs = require('express-handlebars'); 
var user = require('./models/user'); 
var credentials = require('./credentials.json'); 
var passport = require('passport'); 
var TwitterStrategy = require('passport-twitter').Strategy; 
var FacebookStrategy = require('passport-facebook').Strategy; 
var CookieParser = require('cookie-parser'); 
var ExpressSession = require('express-session'); 
var mongoose = require('mongoose'); 

passport.use(new FacebookStrategy({ 
    clientID: credentials.facebook.app_id, 
    clientSecret: credentials.facebook.app_secret, 
    callbackURL: credentials.facebook.callback, 
    profileFields:['id','displayName','emails'] 
    }, function(accessToken, refreshToken, profile, done) { 
     console.log(profile); 
     var me = new user({ 
      email:profile.emails[0].value, 
      name:profile.displayName 
     }); 

     /* save if new */ 
     user.findOne({email:me.email}, function(err, u) { 
      if(!u) { 
       me.save(function(err, me) { 
        if(err) return done(err); 
        done(null,me); 
       }); 
      } else { 
       console.log(u); 
       done(null, u); 
      } 
     }); 
    } 
)); 

passport.use(new TwitterStrategy({ 
    consumerKey: credentials.twitter.consumer_key, 
    consumerSecret: credentials.twitter.consumer_secret, 
    callbackURL: credentials.twitter.callback, 
    includeEmail:true 
    }, 
    function(token, tokenSecret, profile, done) { 

     var me = new user({ 
      email:profile.emails[0].value, 
      name:profile.displayName 
     }); 

     /* save if new */ 
     user.findOne({email:me.email}, function(err, u) { 
      if(!u) { 
       me.save(function(err, me) { 
        if(err) return done(err); 
        done(null,me); 
       }); 
      } else { 
       console.log(u); 
       done(null, u); 
      } 
     }); 

    } 
)); 

passport.serializeUser(function(user, done) { 
    console.log(user); 
    done(null, user._id); 
}); 

passport.deserializeUser(function(id, done) { 
    user.findById(id, function(err, user) { 
     done(err, user); 
    }); 
}); 

var app = express(); 
app.use(CookieParser(credentials.cookieSecret)); 
app.use(ExpressSession({ 
    resave:false, 
    saveUninitialized:false, 
    secret:credentials.cookieSecret 
})); 

app.use(passport.initialize()); 
app.use(passport.session()); 

app.engine('handlebars', exphbs({ 
    defaultLayout:'main' 
})); 
app.set('view engine', 'handlebars'); 

var opts = { 
    server: { 
     socketOptions: { keepAlive: 1 } 
    } 
}; 

switch(app.get('env')) { 
    case 'development': 
     mongoose.connect(credentials.mongo.development.connectionString, opts); 
     break; 
    case 'production': 
     mongoose.connect(credentials.mongo.production.connectionString, opts); 
     break; 
    default: 
     throw new error('Unknown execution environment: ', app.get('env')); 
} 

app.set('port', process.env.PORT || 4000); 
app.use(express.static(__dirname + '/public')); 

function isLoggedIn(req, res, next) { 
    req.loggedIn = !!req.user; 
    next(); 
} 

app.get('/', isLoggedIn, function(req, res) { 
    res.render('index', { 
     title:'Welcome to Fool', 
     loggedIn:req.loggedIn 
    }); 
}); 

app.get('/auth/facebook', passport.authenticate('facebook', {scope:"email"})); 
app.get('/auth/facebook/callback', passport.authenticate('facebook', 
{ successRedirect: '/', failureRedirect: '/login' })); 

app.get('/auth/twitter', passport.authenticate('twitter', {scope:['include_email=true']})); 
app.get('/auth/twitter/callback', passport.authenticate('twitter', 
    { successRedirect: '/', failureRedirect: '/login' })); 

app.get('/login', isLoggedIn, function(req, res) { 
    if(req.loggedIn) res.redirect('/'); 
    console.log(req.loggedIn); 
    res.render('login', { 
     title:'Login/Registration' 
    }); 
}); 

// 500 error handler (middleware) 
app.use(function(err, req, res, next){ 
    console.error(err.stack); 
    res.status(500); 
    res.render('error'); 
}); 

app.listen(app.get('port'), function() { 
    console.log('Express running on http://localhost:' + app.get('port')); 
}); 

如何使這個代碼（從上面的教程）任何想法的作品？

現在我需要解決上述錯誤。

Answer 1

這似乎是因爲您從中獲取代碼的存儲庫不包含任何HTML文件/模板，也沒有註冊應從其加載模板的任何目錄。此外，如果您在您從以下位置複製的存儲庫中查看：https://github.com/napolev/stackoverflow-question，則會看到您的同一錯誤是作爲該存儲庫上的錯誤提交的。

因此，這可能不是一個現成的服務器。通常情況下，你將有一個views子目錄，然後使用類似：

app.set('views', path.join(__dirname, "views")); 

註冊其位置。然後，你會在你的目錄中有你的模板。