angular.module('myapp',
      ['highcharts-ng',
        // more modules here..
      ])

<div class="row">
    <highchart id="chart1" config="chartConfig"></highchart>
</div>

function DashboardController ($scope, Principal, LoginService, $state) {
    $scope.chartConfig ={
       ....// configuration details
    };
}();

angular.js:13920 TypeError: Cannot read property 'Chart' of undefined
    at initChart (highcharts-ng.js:334)
    at linkWithHighcharts (highcharts-ng.js:349)
    at highchartsCb (highcharts-ng.js:463)
    at processQueue (angular.js:16383)
    at angular.js:16399
    at Scope.$eval (angular.js:17682)
    at Scope.$digest (angular.js:17495)
    at Scope.$apply (angular.js:17790)
    at done (angular.js:11831)
    at completeRequest (angular.js:12033)