title: Error while sending email using Sendgrid and NodeJS
body: <p>I'm sending emails with Sendgrid and NodeJS but got the following error: </p>
  
  <pre><code>D:\NodejsCODE\email_app\app.js:19
  from_email = new helper.Email("test@example.com")
                          ^
  
  TypeError: Cannot read property 'Email' of undefined
  at Object.&lt;anonymous&gt; (D:\NodejsCODE\email_app\app.js:19:24)
  at Module._compile (module.js:570:32)
  at Object.Module._extensions..js (module.js:579:10)
  at Module.load (module.js:487:32)
  at tryModuleLoad (module.js:446:12)
  at Function.Module._load (module.js:438:3)
  at Module.runMain (module.js:604:10)
  at run (bootstrap_node.js:394:7)
  at startup (bootstrap_node.js:149:9)
  at bootstrap_node.js:509:3
  </code></pre>
  
  <p>And the code:</p>
  
  <pre><code>var express = require('express');
  var path = require('path');
  var favicon = require('serve-favicon');
  var logger = require('morgan');
  var cookieParser = require('cookie-parser');
  var bodyParser = require('body-parser');
  var config = require('./config');
  
  var index = require('./routes/index');
  var users = require('./routes/users');
  
  var app = express();
  app.set('my_api_key', config.access_key);
  var helper = require('sendgrid').mail
  
  from_email = new helper.Email("test@example.com")
  to_email = new helper.Email("rahilansari261@gmail.com")
  subject = "Sending with SendGrid is Fun"
  content = new helper.Content("text/plain", "and easy to do anywhere, even with Node.js")
  mail = new helper.Mail(from_email, subject, to_email, content)
  
  var sg = require('sendgrid')(my_api_key);
  var request = sg.emptyRequest({
    method: 'POST',
    path: '/v3/mail/send',
    body: mail.toJSON()
  });
  
  sg.API(request, function(error, response) {
    console.log(response.statusCode)
    console.log(response.body)
    console.log(response.headers)
  })
  // view engine setup
  app.set('views', path.join(__dirname, 'views'));
  
  var port            =       process.env.PORT || 3000;
  app.set('view engine', 'jade');
  
  // uncomment after placing your favicon in /public
  //app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
  app.use(logger('dev'));
  app.use(bodyParser.json());
  app.use(bodyParser.urlencoded({ extended: false }));
  app.use(cookieParser());
  app.use(express.static(path.join(__dirname, 'public')));
  // console.log("hlo");
  app.use('/', index);
  app.use('/users', users);
  
  // catch 404 and forward to error handler
  app.use(function(req, res, next) {
    var err = new Error('Not Found');
    err.status = 404;
    next(err);
  });
  
  // error handler
  app.use(function(err, req, res, next) {
    // set locals, only providing error in development
    res.locals.message = err.message;
    res.locals.error = req.app.get('env') === 'development' ? err : {};
  
    // render the error page
    res.status(err.status || 500);
    res.render('error');
  });
  app.listen(port);
  console.log('Magic Happens @ http://localhost:' + port);
  module.exports = app;
  </code></pre>