Unable to login with credential file

[abdulbarik]

@fedecia
Hi I am just trying to implement this module to get messages list.
I didn't get any proper example to implement this module
what I have tried yet

var gmailApiSync = require('gmail-api-sync');
var outh=gmailApiSync.setClientSecretsFile('./client2.json');

 var options = {query: 'from:facebook.com newer_than:2d'};
gmailApiSync.queryMessages(outh, options, function (err, response) {

	console.log(err,response)
})

I am getting following error

Error: listMessagesInitial: The API returned an error: Error: Login Required

Can you please correct me where I am doing typo mistake?