Error: [A]System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to [B]System.Web.WebPages.Razor.Configuration.HostSection in ASP.Net MVC

Hi,

I got this eroor while trying the example from the link

http://www.aspsnippets.com/Articles/Call-Consume-Web-API-using-jQuery-AJAX-in-ASPNet-MVC.aspx

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=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'. Type B originates from 'System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\Users\seo\AppData\Local\Temp\Temporary ASP.NET Files\root\452f1176\313bd1b9\assembly\dl3\264150a3\ab6aa37f_5071d201\System.Web.WebPages.Razor.dll'.

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Please help