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Property 'ordinal' of undefined

See original GitHub issue

Hi, I have tried a simple copy-paste example but wouldn’t work. There is this error thrown

ypeError: Cannot read property 'ordinal' of undefined at Object.a.models.discreteBar (nv.d3.min.js:4) at Object.a.models.discreteBarChart (nv.d3.min.js:5) at Object.updateWithOptions (angular-nvd3.min.js:1) at Object.refresh (angular-nvd3.min.js:1) at Object.<anonymous> (angular-nvd3.min.js:1) at Object.fn (angular-nvd3.min.js:1) at n.$digest (angular.min.js:132) at n.$apply (angular.min.js:135)

However, my code in html <nvd3 options="options" data="data"></nvd3>

and dependables in my gulpfile;

        'lib/moment.min.js',
    'lib/d3.min.js',
    'lib/nv.d3.min.js', 
    'lib/angular-nvd3.min.js',

and the controller looks like

         $scope.options = {
            chart: {
                type: 'discreteBarChart',
                height: 450,
                margin : {
                    top: 20,
                    right: 20,
                    bottom: 50,
                    left: 55
                },
                x: function(d){return d.label;},
                y: function(d){return d.value;},
                showValues: true,
                valueFormat: function(d){
                    return d3.format(',.4f')(d);
                },
                duration: 500,
                xAxis: {
                    axisLabel: 'X Axis'
                },
                yAxis: {
                    axisLabel: 'Y Axis',
                    axisLabelDistance: -10
                }
            }
        };

        $scope.data = [
        {
            key: "Cumulative Return",
            values: [
            {
                "label" : "A" ,
                "value" : -29.765957771107
            } ,
            {
                "label" : "B" ,
                "value" : 0
            } ,
            {
                "label" : "C" ,
                "value" : 32.807804682612
            } , 
            ]
        }
        ]