does not contain a definition for HtmlConvertToJson

I am getting the below error which I can't find any solution in the internet :

System.Collections.Generic.IEnumerable<>does not contain a definition for 'HtmlConvertToJson and no

extension method 'HtmlConvertToJson accepting a first argument of type 'System.Wev.Mvc.HtmlHelper<System.Collections.GenericIEnumerable<> could

be found(are you missing a using directive or an assembly

And this is the page where the error occurs at the line new ViewModel(@Html.HtmlConvertToJson(Model)));

Hope someone can help me out on this.

@model IEnumerable<BootstrapIntroduction.Models.Author>
@{
ViewBag.Title = "Authors";
}
<h2>Authors</h2>
<p>
@Html.ActionLink("Create New", "Create")
</p>
<table class="table table-bordered table-striped">
<thead>
<tr>
<th>@Html.DisplayNameFor(model => model.FirstName) </th>
<th>@Html.DisplayNameFor(model => model.LastName) </th>
<th>@Html.DisplayNameFor(model => model.Biography) </th>
<th>Actions</th>
</tr>
</thead>
<tbody data-bind="foreach: authors">
<tr>
<td data-bind="text: FirstName"></td>
<td data-bind="text: LastName"></td>
<td>
<a data-bind="attr {href: '@Url.Action("Details")/' + Id }" class="btn btn-info">Details</a>
<a data-bind="attr {href: '@Url.Action("Edit")/' + Id }" class="btn btn-primary">Edit</a>
<a data-bind="attr: {href: '@Url.Action("Delete")/' + Id }" class="btn btn-danger">Delete</a>
</td>
</tr>
</table>
@section Scripts {
<script>
function ViewModel(authors) {
var self = this;
self.authors = authors;
};
var viewModel = new ViewModel(@Html.HtmlConvertToJson(Model)));
ko.applyBindings(viewModel);
</script>
}

I have added in the necessary library at the HTMLHelperExtension :

using BootstrapIntroduction.Models;
using Newtonsoft.Json;
using System.Web;
using System.Web.Mvc;
namespace BootstrapIntroduction.HtmlHelperExtension
{
public static class HtmlHelpherExtensions
{
public static HtmlString HtmlConvertToJson(this HtmlHelper htmlHelper, object model)
{
var settings = new JsonSerializerSettings
{
ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
Formatting = Formatting.Indented
};
return new HtmlString(JsonConvert.SerializeObject(model, settings));
}
}
}

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