ReferenceError: '_' is undefined

[amurtola]

[app] [Error] '' is undefined [object Object] ReferenceError: '' is undefined at $scope.isChecked (https://localhost:44300/Scripts/angularjs-dropdown-multiselect.js:288:21) at fn0 (Function code:2:1316) at expressionInputWatch (https://localhost:44300/scripts/angular.js:14302:11) at Scope.prototype.$digest (https://localhost:44300/scripts/angular.js:15818:21) at Scope.prototype.$apply (https://localhost:44300/scripts/angular.js:16097:13) at Anonymous function (https://localhost:44300/scripts/angular.js:17864:25) at completeOutstandingRequest (https://localhost:44300/scripts/angular.js:5507:7) at Anonymous function (https://localhost:44300/scripts/angular.js:5784:7) undefined [app] [Error] '_' is undefined [object Object]

Where can be a problem. i have

export var app = angular.module('app', [
       ...,
    'angularjs-dropdown-multiselect',
    'ngLodash'
]);

references and

<script src="Scripts/angular-lodash.js"></script>
<script src="Scripts/angularjs-dropdown-multiselect.js"></script>

in html. Also i have select initiation like in examples. But '_' is undefined.