api connection to back-end data store is failing

I am getting TypeError: usergrid.client is not a constructor".
Any one has any suggestions? I am trying to connect to a backend data store using nodejs. Any suggestion?

    var express = require('express');
    var bodyParser = require('body-parser');
    var usergrid = require('usergrid');
    var config = require('./config');

var client = new usergrid.client({
    'orgName': config.organization,
    'appName': config.application,
    'clientId': config.clientId,
    'clientSecret': config.clientSecret,
    'authType': usergrid.AUTH_CLIENT_ID,
    logging: config.logging
});

via Demesew Abebe