title: require() throw “AssertionError: missing path” - Node js
body: <p>I am trying out a simple nodejs application.All works fine until i separate db model into user file and requiring it in the routes.js.Then it gives out a “AssertionError: missing path” error when i try to run the server.</p>
  
  <p><strong>routes.js</strong> (path='demo/app/routes.js')</p>
  
  <pre><code>var User=require('./models/user');
  
  module.exports=function(app){
      app.get('/',function(req,res){
          res.send("hello world");
      });
  
      app.get('/:username/:password',function(req,res){
          var newUser =new User();
          newUser.local.username=req.params.username;
          newUser.local.password=req.params.password;
          console.log(newUser.local.username);
          newUser.save(function(err){
              if(err){
                  throw err;
              }
          });
          res.send('success');
      });
  }
  </code></pre>
  
  <p><strong>user.js</strong> (path='demo/app/models/user.js')</p>
  
  <pre><code>var mongoose=require(mongoose);
  
  var userScheme=mongoose.Schema({
      local:{
          username:String,
          password:String
      }
  });
  
  module.exports=mongoose.model('User',userScheme);
  </code></pre>
  
  <p><strong>server.js</strong> running file (demo/server.js)</p>
  
  <pre><code>var express=require('express');
  var app=express();
  var port =process.env.PORT||3000;
  
  var morgan=require('morgan');
  var cookieParser=require('cookie-parser');
  var session=require('express-session');
  var mongoose=require('mongoose');
  
  var configDB=require('./config/database.js');
  mongoose.connect(configDB.url);
  
  app.use(morgan('dev'));
  app.use(cookieParser());
  app.use(session({
      secret:'pokemonGo',
      saveUninitialized:true,
      resave:true
  }));
  
  require('./app/routes.js')(app);
  
  app.listen(port);
  console.log('server running ');
  </code></pre>
  
  <p><strong>and the error says</strong></p>
  
  <pre><code>assert.js:90
    throw new assert.AssertionError({
    ^
  AssertionError: missing path
      at Module.require (module.js:351:3)
      at require (internal/module.js:12:17)
      at Object.&lt;anonymous&gt; (/Users/menaka/WebstormProjects/cardCreaterServer/app/models/user.js:4:14)
      at Module._compile (module.js:409:26)
      at Object.Module._extensions..js (module.js:416:10)
      at Module.load (module.js:343:32)
      at Function.Module._load (module.js:300:12)
      at Module.require (module.js:353:17)
      at require (internal/module.js:12:17)
      at Object.&lt;anonymous&gt; (/Users/menaka/WebstormProjects/cardCreaterServer/app/routes.js:4:10)
      at Module._compile (module.js:409:26)
      at Object.Module._extensions..js (module.js:416:10)
      at Module.load (module.js:343:32)
      at Function.Module._load (module.js:300:12)
      at Module.require (module.js:353:17)
      at require (internal/module.js:12:17)
  </code></pre>