MVC4 Azure Publishing Error - Could not load file or assembly 'System.Web.Razor'

Question

The project runs fine locally, its only when published I get the following error:

Could not load file or assembly 'System.Web.Razor' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Having spent the last few hours googling the problem seems to be that a nuget package I added to the project references razor 1 and overwrote my razor 2 dll. I've tried copying the razor 2.0.0.0 dll into refernces instead of 1 but the error persists. This is where the conflict is shown in the detailed build output:

There was a conflict between "System.Web.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" and "System.Web.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35".
1>      "System.Web.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" was chosen because it was primary and "System.Web.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" was not.
1>      References which depend on "System.Web.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" [C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\Assemblies\System.Web.Razor.dll].
1>          C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\Assemblies\System.Web.Razor.dll
1>            Project file item includes which caused reference "C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\Assemblies\System.Web.Razor.dll".
1>              System.Web.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL
1>      References which depend on "System.Web.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" [C:\Users\Jack\SkyDrive\LessonUp.Current\packages\RazorEngine.3.0.8\lib\net40\System.Web.Razor.dll].
1>          C:\Users\Jack\SkyDrive\LessonUp.Current\packages\Microsoft.AspNet.WebPages.2.0.20710.0\lib\net40\System.Web.WebPages.Razor.dll
1>            Project file item includes which caused reference "C:\Users\Jack\SkyDrive\LessonUp.Current\packages\Microsoft.AspNet.WebPages.2.0.20710.0\lib\net40\System.Web.WebPages.Razor.dll".
1>              System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL 
1>              Recaptcha

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From there it continues to list other packages depending on razor 2.

The packages I added to the project were: Recaptcha, Recaptcha.mvcModel and Postal.
Does anyone have an idea what steps I can take to resolve this?
Let me know if there is any more information I can give that might lead to a solution.

Answer 1

Make sure the 2.0 dll is referenced and copy local = true, then try adding an assembly binding redirect in the web.config:

<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
  <dependentAssembly>
    <assemblyIdentity name="System.Web.Razor" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" />
  </dependentAssembly>
</assemblyBinding?