nodemailer/nodemailer

hey guys please help me ...
it's a minor issue i know, but i'm hung in various tasks at the moment.

i'm using https://nodemailer.com/2-0-0-beta/templating/
templating provided by node mailer,

i've created my html.ext file and kept in template folder,

i'm using snippet

var EmailTemplate = require('email-templates').EmailTemplate;
var transporter = nodemailer.createTransport('smtps://user%40gmail.com:pass@smtp.gmail.com');

// create template based sender function
// assumes text.{ext} and html.{ext} in template/directory
var sendPwdReminder = transporter.templateSender(new EmailTemplate('template'), {
    from: 'sender@example.com',
});

// use template based sender to send a message
sendPwdReminder({
    to: 'receiver@example.com',
    // EmailTemplate renders html and text but no subject so we need to
    // set it manually either here or in the defaults section of templateSender()
    subject: 'Password reminder'
}, {
    username: 'Node Mailer',
    password: '!"\'<>&some-thing'
}, function(err, info){
    if(err){
       console.log('Error');
    }else{
        console.log('Password reminder sent');
    }
});

but unable to send Email

should i change this line

var sendPwdReminder = transporter.templateSender(new EmailTemplate('template'), {

to

var sendPwdReminder = transporter.templateSender(new EmailTemplate('template/html.ext'), {

please help me out as my err response is coming blank.