TypeError: firebase.storage(...).ref(...).once is not a function during retrive the images from Firebase in AngularJS? -


i have retirive image firebase firebase in angularjs got error?

//get images firebase  $scope.getimages = function() {    firebase.storage().ref('user/image').once('value').then(function(snapshot) {      var value = snapshot.val();    })  }
<div class="pull-right">      <input type="submit" name="sumbit" value="submit" ng-click="getimages()">  </div>

enter image description here


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