MVC4: making the area work for beginner - asp.net-mvc

Question

I wanted to try and use area (just trying out). I added a area foo to my project: right click on the project then add area.
That folder contains sub folders where I can add controllers, view, models etc. It also has a cs file fooAreaRegistration.cs where routing for the area is done.
using System.Web.Mvc;
namespace AreasExample.Areas.foo
{
public class fooAreaRegistration : AreaRegistration
{
public override string AreaName
{
get
{
return "foo";
}
}
public override void RegisterArea(AreaRegistrationContext context )
{
context.MapRoute(
"foo_default",
"foo/{controller}/{action}/{id}",
new {controller = "Foo", action = "Index", id = UrlParameter.Optional }
);
}
}
}
Global.asax already has a function for registering area in app start
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
RegisterRoutes(RouteTable.Routes);
}
}
}
I also then created a controller Foo which already has a default Index action, after that I added a view to the action. Based on the context.MapRoute in fooAreaRegistration.cs, if I run the program and go to this link http://localhost:54421/foo/Foo shouldn't it be working?
It shows some error when I go to my area foo and controller Foo.
Error says
Server Error in '/' Application.
[A]System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to
[B]System.Web.WebPages.Razor.Configuration.HostSection. Type A originates from 'System.Web.WebPages.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Razor\v4.0_1.0.0.0__31bf3856ad364e35\System.Web.WebPages.Razor.dll'. Type B originates from 'System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Razor\v4.0_2.0.0.0__31bf3856ad364e35\System.Web.WebPages.Razor.dll'.
Is there something I'm missing? Do I need to add something?
Edit: I'm not sure if I should delete this post as I found the answer which is mentioned as answer below. But then it may be helpful for those who are following the same book(ASP.NET MVC4 in action).
Suggestions?

Answer 1

That was probably because I downloaded the project of the book from internet which had older version of razor, and after I created an area in that project it couldn't cast it to the latest version of razor(i'm guessing) as the warning as in visual studio says:
Warning 1 D:\Tutorial\mvc4ia-2012-06-
13\src4\Chapter13\AreasExample\Areas\foo\Views\Foo\Index.cshtml: ASP.NET runtime error:
[A]System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to
[B]System.Web.WebPages.Razor.Configuration.HostSection. Type A originates from
'System.Web.WebPages.Razor, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location
'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Razor\v4.0_1.0.0.0__31bf385
6ad364e35\System.Web.WebPages.Razor.dll'.
Type B originates from 'System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Razor\v4.0_2.0.0.0__31bf385
6ad364e35\System.Web.WebPages.Razor.dll'. D:\Tutorial\mvc4ia-2012-06-
13\src4\Chapter13\AreasExample\Areas\foo\Views\Foo\Index.cshtml AreasExample