tm_twitter_apiでうまく認証できない

// Resources/app.js
var path_lib = '';
Titanium.include('lib/twitter_api.js');
Titanium.App.twitterApi = new TwitterApi({
	consumerKey: 'MY CONSUMER KEY',
	consumerSecret: 'MY CONSUMER SECRET'
});
var twitterApi = Titanium.App.twitterApi
twitterApi.init();