google analytics

Hi , I'm facing with one issue can any one guide me please.Actually i'm doing page analytics in my app. I wrote the code like this in

alloy.js

var GA = require('analytics.google');
GA.debug = true;
GA.trackUncaughtExceptions = true;
Alloy.Globals.tracker = GA.getTracker("UA-46952860-1");

Alloy.Globals.tracker.trackScreen("index");