I have a page with local block

[ContentType(GUID = "d9298163-9046-4bd1-9ff1-81e5abb83a80", AvailableInEditMode = true)]
public class StartPage : BasePageData
{
private const string LeftNavigationMenu = "Left Navigation";

[CultureSpecific(true)]
[Display(GroupName = SystemTabNames.Content, Order = 50)]
public virtual ContentArea MainContentAreaTop { get; set; }

[CultureSpecific(true)]
[Display(GroupName = SystemTabNames.Content, Order = 60)]
public virtual ContentArea MainContentArea { get; set; }

[Display(GroupName = FooterSettingsBlock.FooterTab, Order = 100)]
public virtual FooterSettingsBlock FooterSettings { get; set; }

And I try to render partial view and send to view FooterSettings: 

@{
Html.RenderPartial("Shared/Footer", @Model.SiteSettings.MySiteSettingsPage.SiteStartPage.ToPage<StartPage>().FooterSettings);
}

I have a logic in StartPageController: 

public class StartPageController : BasePageController<StartPage>
{[HttpPost]

public ActionResult Subscribe(SubscriptionViewModel model)
{
return Redirect("/");
}
}

and try to call this method from partial Footer view:

@model Valtech.Core.Website.Models.Blocks.FooterSettingsBlock

<div>
<h3>@Html.PropertyFor(m => m.SubscriptionHeading)</h3>

@Html.Partial("shared/Subscription", new SubscriptionViewModel {CurrentBlock=Model})
</div>

Subscription partial view:

@model Valtech.Core.Website.Models.ViewModels.SubscriptionViewModel

@using (Html.BeginForm("Subscribe", "StartPage", FormMethod.Post, new { id = "subscribeForm" }))
{
<input name="Email" id="userEmail" type="text" placeholder="@Model.CurrentBlock.EnterEmailText"/>
<a href="javascript:document.getElementById('subscribeForm').submit()">@Model.CurrentBlock.SubmitText</a>
}

When I click my link, I get TypeMismatchException and this stackTraice:

[TypeMismatchException: The existing IContentData instance is of type 'Castle.Proxies.ExtaviaStartPageProxy' and does not match the requested type 'Valtech.Core.Website.Models.Blocks.Extavia.ExtaviaFooterSettingsBlock'.]
   EPiServer.Web.Mvc.ContentDataModelBinder.BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +718
   System.Web.Mvc.DefaultModelBinder.GetPropertyValue(ControllerContext controllerContext, ModelBindingContext bindingContext, PropertyDescriptor propertyDescriptor, IModelBinder propertyBinder) +33
   System.Web.Mvc.DefaultModelBinder.BindProperty(ControllerContext controllerContext, ModelBindingContext bindingContext, PropertyDescriptor propertyDescriptor) +493
   System.Web.Mvc.DefaultModelBinder.BindProperties(ControllerContext controllerContext, ModelBindingContext bindingContext) +283
   System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +675
   System.Web.Mvc.ControllerActionInvoker.GetParameterValue(ControllerContext controllerContext, ParameterDescriptor parameterDescriptor) +484
   System.Web.Mvc.ControllerActionInvoker.GetParameterValues(ControllerContext controllerContext, ActionDescriptor actionDescriptor) +153
   System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__1e(AsyncCallback asyncCallback, Object asyncState) +839839
   System.Web.Mvc.Async.WrappedAsyncResult`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +146
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate`1 endDelegate, Object tag, Int32 timeout) +166
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate`1 endDelegate, Object tag) +27
   System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__17(AsyncCallback asyncCallback, Object asyncState) +50
   System.Web.Mvc.Async.WrappedAsyncResult`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +146
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate`1 endDelegate, Object tag, Int32 timeout) +166
   System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback, Object state) +826929
   System.Web.Mvc.Async.WrappedAsyncResult`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +146
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate`1 endDelegate, Object tag, Int32 timeout) +166
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate endDelegate, Object tag) +27
   System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +401
   Valtech.Core.Website.Controllers.ExtaviaStartPageController.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) in c:\Projects\Msliv\trunk\EPiServerCMS\branches\Extavia\Valtech.Core.Website\Controllers\ExtaviaStartPageController.cs:11
   System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__2(AsyncCallback asyncCallback, Object asyncState) +787034
   System.Web.Mvc.Async.WrappedAsyncResult`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +146
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate`1 endDelegate, Object tag, Int32 timeout) +166
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate endDelegate, Object tag) +27
   System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +343
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +12639247
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +288


Could somebody help me with this problem?