Server Error in '/' Application. on asp.net

Question

Getting this error when working on nopcommerce theme

[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\Designer_2\AppData\Local\Temp\Temporary ASP.NET Files\root

\c152d41b\a654685e\assembly\dl3\d2c346c5\cbf4b46b_e2d3ce01\System.Web.WebPages.Razor.dll'.

Please advise how to solve?

Can you please provide the code where you're performing the cast? — mason
– mason, Commented Mar 20, 2014 at 13:49

Matt Millican · Accepted Answer · 2014-03-20 13:55:00Z

1

Make sure in the web.config in your application root and Views folder are referencing the same version of Razor that you're referencing in your project, similar to below:

<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>

answered Mar 20, 2014 at 13:55

Matt Millican

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