Não é possível resolver o símbolo 'Página' - c #, razor, owin, nancy

Depois de decidir mover tudo para Owin, Eu escolhi NancyFx para lidar com minhas rotas, pontos de vista, etc ... no entanto Nancy Razor não parece funcionar bem porque eu tenho alguns problemas estranhos como

1. Não é possível resolver o símbolo "X".
2. Não é possível resolver a seção "X".

Aqui está uma foto mostrando o que está acontecendo dentro do visual studio ...

E aqui está o meu arquivo web.config

<?xml version="1.0" encoding="utf-8"?>
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=169433
-->
<configuration>
<configSections>
<sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
<section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
<section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
<section name="razor" type="Nancy.ViewEngines.Razor.RazorConfigurationSection, Nancy.ViewEngines.Razor" />
</sectionGroup>
</configSections>
<!--
For a description of web.config changes see http://go.microsoft.com/fwlink/?LinkId=235367.

The following attributes can be set on the <httpRuntime> tag.
<system.Web>
<httpRuntime targetFramework="4.5.1" />
</system.Web>
-->
<system.web>
<compilation debug="true" targetFramework="4.5.1">

<buildProviders>
<add extension=".cshtml" type="Nancy.ViewEngines.Razor.BuildProviders.NancyCSharpRazorBuildProvider, Nancy.ViewEngines.Razor.BuildProviders" />
<add extension=".vbhtml" type="Nancy.ViewEngines.Razor.BuildProviders.NancyVisualBasicRazorBuildProvider, Nancy.ViewEngines.Razor.BuildProviders" />
</buildProviders>
</compilation>
<httpRuntime targetFramework="4.5.1" />
</system.web>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true" />
</system.webServer>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="Microsoft.Owin" publicKeyToken="31bf3856ad364e35" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Razor" publicKeyToken="31bf3856ad364e35" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-5.2.3.0" newVersion="5.2.3.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>

<system.web.webPages.razor>
<pages pageBaseType="Nancy.ViewEngines.Razor.NancyRazorViewBase">
<namespaces>
<add namespace="Rockariam.Core.Controllers"/>
<add namespace="Rockariam.Core.Libraries"/>
<add namespace="Rockariam.Core.Models"/>
<add namespace="System"/>
<add namespace="System.Linq"/>
</namespaces>
</pages>
</system.web.webPages.razor>

<appSettings>
<add key="webPages:Enabled" value="false" />
</appSettings>
</configuration>

Respostas:

Para configurar o Nancys flavor of Razor, você precisa de uma seção Razor no seu app.config. Vejo https://github.com/NancyFx/Nancy/wiki/Razor-View-Engine para informações detalhadas.