Page is displaying java runtime error in razor 5.1 page

@{
    ViewBag.Title = "Index";
}
<script src="http://code.jquery.com/jquery-1.12.4.min.js"></script>
<link href="http://cdn.rawgit.com/davidstutz/bootstrap-multiselect/master/dist/css/bootstrap-multiselect.css"
      rel="stylesheet" type="text/css" />
<script src="http://cdn.rawgit.com/davidstutz/bootstrap-multiselect/master/dist/js/bootstrap-multiselect.js"></script>
<link href="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/css/bootstrap.min.css"
      rel="stylesheet" type="text/css" />
<script src="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/js/bootstrap.min.js"></script>

<script type="text/javascript">
    $(document).ready(function () {
        $(function () {
            $('#mySkills').multiselect({
                includeSelectAllOption: true
            });
        });
        $("#btnGetSkills").click(function () {
            alert($("#mySkills").val());
        });
    });
</script>

<h2>Multiselect Dropdown with Checkbox</h2>
<div>
    <select id="mySkills" multiple="multiple" required name="mySkillsName">
        @if (ViewBag.mySkills != null)
            {
                foreach (var item in ViewBag.mySkills)
                {
                    if (item.Text != null)
                    {
                    <option value="@item.Value">
                        @item.Text
                    </option>
                }
            }
        }
    </select>
</div>
<br />
<br />
<input type="button" id="btnGetSkills" value="Click me to Get Selected Skill(s)" />