$rootScope not working?

@IonBruno wrote:

.controller('AppCtrl', function($scope, $rootScope, $ionicLoading) {
  $rootScope.colorg = 'blue';
})

.controller('CategoriasCtrl', function($scope, Categorias, $ionicLoading, $rootScope) {
  console.log($rootScope.colorg);
})

Because the console.log returns undefined me?

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