Could not load file or assembly 'System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, or one of its dependencies

Question

Please somebody help me fix this issue.

Umbraco application as parent on IIS6 has the following version of System.Web.WebPages.Razor.

  <sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
  <section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
  <section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection, System.Web.WebPages.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
  </sectionGroup>

  <system.web.webPages.razor>
  <host factoryType="System.Web.WebPages.Razor.WebRazorHostFactory, System.Web.WebPages.Razor" />
  <pages pageBaseType="System.Web.WebPages.WebPage">
  <namespaces>
    <add namespace="Microsoft.Web.Helpers" />
    <add namespace="umbraco" />
    <add namespace="Examine" />
  </namespaces>
</pages>

Blog Engine application as virtual directory under the Umbraco application on IIS6 has the following version of System.Web.WebPages.Razor.

<configSections>
<remove name="system.web.webPages.razor" />
</configSections>

<assemblies>
<add assembly="System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
</assemblies>

<dependentAssembly>
<assemblyIdentity name="System.Web.WebPages.Razor" publicKeyToken="31BF3856AD364E35" culture="neutral" />
<bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" />
</dependentAssembly>

Even after i added the dependentAssembly still nothing works for me, Am wasting more than a week on this issue, Please help.

Answer 1

Have you checked the actual version of System.Web.WebPages.Razor that is currently deployed to your bin folder? I had a similar issue recently in a multi-project solution and one of the projects was using an older version of the assembly via Nuget which happened to be the one that ended up in the bin folder causing a similar error. In fact I'm pretty sure that it's the Umbraco Nuget package copying in the older assembly.