ngCordova ibeacon: $rootScope.$on don't fire?

Hey guys,
I am trying to build my first app with ionic and angular. In this app I want to use an ibeacon. My problem is now, that I can’t get any information from the ibeacon.
I tried this here as discribed: ibeacon ngCordova,
also this: support ibeacons in your ionic framework ,but I’m still not able to get it to run.
I even reinstalled the ibeacon plugin from github and checked the permissons for bluetooth in the android xml file.

Here is my Code:

angular.module('meineapp.datactrl', ['btford.socket-io','angular-md5','ionic','ngCordova'])

.controller('DataCtrl', function($rootScope,$scope,socket,md5,$ionicPlatform,$ionicPopup,$ionicLoading,$cordovaGeolocation,$cordovaBeacon){

	$scope.beacon = {};
	$ionicPlatform.ready(function () {
		var identifier = "Beacon";
		var uuid = "f0018b9b-7509-4c31-a905-1a27d39c003c";
		var major = 23075;
		var minor = 20481;
		var notifyEntryStateOnDisplay = true;
			$scope.startRangingBeaconsInRegion = function() {
					identifier, uuid, major, minor, notifyEntryStateOnDisplay)
			$rootScope.$on("$cordovaBeacon:didRangeBeaconsInRegion", function (ev, pluginResult) {
					$scope.beacon.proximity = pluginResult.beacons[0].proximity;

I hope somebody can tell me, what I’m doing wrong.

i guess you should call the function $scope.startRangingBeaconsInRegion() to get things started.
Maybe do this after the eventlistener.