In node-js: app.render('filename') generating error on chrome of internal server error.

I'm trying to render the profile.ejs page, but it show the error of "Internal server error".

Status Code:500 Internal Server Error.

var express = require('express');
var app = express();
app.set('view engine', 'ejs');
app.get('/',function(req, res){
  res.sendFile(__dirname + '/index.html');
});
app.get('/profile/:id',function(req, res){
  res.render('profile');
});
app.listen(3000);

via ProgSMI