Open ionicModal on stateChangeStart - angularjs

Question

I have been reviewing the different methods for authorization/authentication in the framework. What I am trying to do is assign a value to a state, then use ui-routers ability to detect the state change using $stateChangeStart. I am injecting the ionicModal service into app.js .run function and then creating the modal and attaching it to the $rootScope. When I try and open it I get the following error:
Cannot read property 'show' of undefined
Here is app.js:
angular.module('authlyApp', ['ionic', 'authlyApp.controllers', 'authlyApp.services'])
.run(function($ionicPlatform, $ionicModal, $rootScope) {
$ionicPlatform.ready(function() {
if (window.cordova && window.cordova.plugins.Keyboard) {
cordova.plugins.Keyboard.hideKeyboardAccessoryBar(true);
cordova.plugins.Keyboard.disableScroll(true);
}
if (window.StatusBar) {
StatusBar.styleDefault();
}
});
$ionicModal.fromTemplateUrl('templates/login.html', {
scope: $rootScope
}).then(function(modal) {
$rootScope.modal = modal;
});
$rootScope.$on('$stateChangeStart',
function(event, next, toState, fromState, toParams, fromParams){
console.log(next)
if ('data' in next && 'requireAuth' in next.data) {
event.preventDefault();
$rootScope.modal.show();
}
});
})
.config(function($stateProvider, $urlRouterProvider) {
$stateProvider
.state('app', {
url: '/app',
abstract: true,
templateUrl: 'templates/menu.html',
controller: 'AppCtrl',
data: {
requireAuth: true
}
})
.state('app.search', {
url: '/search',
views: {
'menuContent': {
templateUrl: 'templates/search.html'
}
}
})
.state('app.browse', {
url: '/browse',
views: {
'menuContent': {
templateUrl: 'templates/browse.html'
}
}
})
.state('app.playlists', {
url: '/playlists',
views: {
'menuContent': {
templateUrl: 'templates/playlists.html',
controller: 'PlaylistsCtrl'
}
}
})
.state('app.single', {
url: '/playlists/:playlistId',
views: {
'menuContent': {
templateUrl: 'templates/playlist.html',
controller: 'PlaylistCtrl'
}
}
});
$urlRouterProvider.otherwise('/app/playlists');
});