Angular Problems!

angularFire.js

app.factory('Auth', ['$firebaseAuth', 'FBURL',
  function($firebaseAuth, FBURL) {
    var ref = new Firebase(FBURL);
    return $firebaseAuth(ref);
}]);

app.factory('User', ['FBURL', '$firebaseObject',
  function(FBURL, $firebaseObject) {
    var ref = new Firebase(FBURL + '/users');
    var userData = {};
    return {
      setUser: function(authData) {
        ref.child(authData.uid).once('value', function(snapshot) {
          if(snapshot.exists()) {
            userData = snapshot.val();
            console.log(userData);
          } else {
            userData = {
              email: authData.google.email,
              avatar: authData.google.profileImageURL,
              account: 'student'
            }
            console.log('new user');
            ref.child(authData.uid).set(userData);
          }
        });
        return userData;
      },
      getUser: function() {
        return userData;
      }
    }
}]);

app.controller('IndexCtrl', ['$scope', '$location', 'Auth', 'User',
  function($scope, $location, Auth, User) {
    $scope.auth = Auth;


    $scope.auth.$onAuth(function(authData) {
      if(authData) {
        User.setUser(authData);
        $location.path('/main');
      }

    });

}]);

app.controller('MainCtrl', ['$scope', 'Auth', '$location', 'User',
  function($scope, Auth, $location, User) {
    $scope.auth = Auth;

    $scope.auth.$onAuth(function(authData) {
      if(authData) {
        $scope.authData = authData;
        $scope.user = User;
      } else {
        $location.path('/');
      }
    })
}]);