Razor view Type does not inherit from 'System.Web.WebPages.WebPage'

I have a problem with configuring asp.net mvc application:

[HttpException (0x80004005): Type 'ASP._Page_Currency_Index_cshtml' does not inherit from 'System.Web.WebPages.WebPage'.]
System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(VirtualPath virtualPath, Type requiredBaseType, HttpContext context, Boolean allowCrossApp) +11454171
System.Web.WebPages.BuildManagerWrapper.CreateInstanceOfType(String virtualPath) +347
System.Web.WebPages.VirtualPathFactoryManager.CreateInstanceOfType(String virtualPath) +239
System.Web.WebPages.WebPageHttpHandler.CreateFromVirtualPath(String virtualPath, IVirtualPathFactory virtualPathFactory) +57
System.Web.WebPages.WebPageRoute.DoPostResolveRequestCache(HttpContextBase context) +407
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +80
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +270

Steps that I want to do:

Move controllers with its views into separate library and put dll into bin folder.

Create virtual file provider and virtual file to get data from assembly:

public override Stream Open()
{
    var resourceName = this.path;
    var asmName = this.assembly.GetName().Name;
    var manifestName = asmName + ".Views" + resourceName.Trim('~').Replace("/", ".");
    var resourceStream = this.assembly.GetManifestResourceStream(manifestName);
    return resourceStream;
}

Add this lines into web.config:

<configSections>
  <sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
    <section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
    <section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection, System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
  </sectionGroup>
</configSections>
<system.web.webPages.razor>
  <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
  <pages pageBaseType="System.Web.Mvc.WebViewPage">
    <namespaces>
      <add namespace="System.Web.Helpers" />
      <add namespace="System.Web.Mvc" />
      <add namespace="System.Web.Mvc.Ajax" />
      <add namespace="System.Web.Mvc.Html" />
      <add namespace="System.Web.Routing" />
      <add namespace="System.Web.WebPages" />
    </namespaces>
  </pages>
</system.web.webPages.razor>

When user access this controller's page it is compiled correctly into the following class:

public class _Page_Currency_Index_cshtml : System.Web.Mvc.WebViewPage<GridModel<CurrencyModel>> {

And after that it fails with this error (and as I can see - he is right, Type 'ASP._Page_Currency_Index_cshtml' does not inherit from 'System.Web.WebPages.WebPage'.)

What should I do to let HttpApplication know that this page should be managed as System.Web.Mvc.WebViewPage instead of System.Web.WebPages.WebPage?

I have tried to move Views/Web.Config into bin folder, but it does not help.

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