Custom plugin - error - does not contain a definition for 'LabelFor'

Compiler Error Message: CS1928: 'System.Web.Mvc.HtmlHelper<Nop.Plugin.MyPlugin.Models.MyModel>' does not contain a definition for 'LabelFor'

@model MyModel
@using Nop.Web.Framework.UI;
@using Nop.Web.Models.Common;
@using Nop.Plugin.MyPlugin.Models;

@Html.HiddenFor(model => model.Id)
<div class="edit-accounttype">
    <div class="inputs">
        @Html.LabelFor(model => model.AccountTypeId, new { }, ":")
...
    </div>

</div>

I've checked my project's web.config and References, and they look similar to that of Payments.Manual (PaymentInfo.cshtml is one of the few out-of-the-box plugins that uses LabelFor)

Thoughts?

Also complains about   @Html.RequiredHint()
yet, Html.DropDownListFor and  @Html.ValidationMessageFor work fine

Test it first without parameters.
@Html.LabelFor(model => model.AccountTypeId)

Is above would be working?

That did it! Thanks.

(I probably don't need the extra params right now, but I'm curious as to why the other overload is not available.  Thoughts?)