angularjs - angular-dimple error TypeError: Cannot read property '_hasCategories' of null -

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i trying build stacked-bar chart using dimple.js need through angular directives using angular-dimple

here have coded run sample example: 

    <script type="text/javascript">         var app = angular.module("dimpletestapp", ['angular-dimple']);           app.controller('myctrl', ['$scope', 'dataservice', function($scope, dataservice) {         dataservice.getdata().then(function(response) {         $scope.graphdata = response.data;         console.log($scope.graphdata);             });         }])         .service('dataservice', ['$http', function($http) {           return {             getdata: function() {               return $http.get('data.json');             }           };         }]); </script> </head> <body ng-app='dimpletestapp'>     <div ng-controller="myctrl">     <graph data="graphdata" orientation="horizontal">         <x-axis field="month"></x-axis>         <y-axis field="sales"></y-axis>         <stacked-bar field="storeid" value="2"></stacked-bar>     </graph>      </div>  </body>

but getting error while running code:

 typeerror: cannot read property '_hascategories' of null @ null.<anonymous> (http://dimplejs.org/dist/dimple.v2.0.0.min.js:1:10314) @ array.foreach (native) @ _getseriesdata (http://dimplejs.org/dist/dimple.v2.0.0.min.js:1:9714) @ draw (http://dimplejs.org/dist/dimple.v2.0.0.min.js:1:20275) @ draw (http://localhost/angular-dimple/bower_components/angular-dimple/lib/angular-dimple.js:175:15) @ addbar (http://localhost/angular-dimple/bower_components/angular-dimple/lib/angular-dimple.js:428:25) @ object.fn (http://localhost/angular-dimple/bower_components/angular-dimple/lib/angular-dimple.js:433:11) @ g.$get.g.$digest (https://ajax.googleapis.com/ajax/libs/angularjs/1.3.0-beta.8/angular.min.js:110:464) @ g.$get.g.$apply (https://ajax.googleapis.com/ajax/libs/angularjs/1.3.0-beta.8/angular.min.js:113:468) @ g (https://ajax.googleapis.com/ajax/libs/angularjs/1.3.0-beta.8/angular.min.js:73:183)

can tell me wrong application , how can make running.

i have solved doing getting deeper angular-dimple library.

there mistake in documentation directive created using x , y elements while in example have mentioned x-axis , y-axis, when changed correct 1 worked.

here modified code:

<graph data="graphdata" orientation="horizontal">         <x field="month"></x>         <y field="sales"></y>         <stacked-bar field="storeid" ></stacked-bar>     </graph>

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