System.ServiceModel.Activation.HttpModule error

Question

what is the cause of this error on below line?

<system.web>
    <globalization fileEncoding="utf-8" requestEncoding="utf-8" responseEncoding="utf-8" culture="fa-IR" uiCulture="fa-IR" />
    <compilation targetFramework="4.0" debug="true">
      <assemblies> <add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral,  PublicKeyToken=b77a5c561934e089" />

Answer 1

Everywhere the problem to this solution was mentioned as re-registering aspNet by using aspnet_regiis.exe. But this did not work for me.

Though this is a valid solution (as explained beautifully here)

but it did not work with Windows 8.

For Windows 8 you need to Windows features and enable everything under ".Net Framework 3.5" and ".Net Framework 4.5 Advanced Services".

Thanks Neha

Answer 2

This happens when you install .Net 4 before enabling IIS, or if you register WCF after registering .Net 4. In either case, your App Pools will be running .Net 2.0 (which is the CLR version required for .Net 3 if you have registered WCF, which installs ASP.Net 3.5, or the default if you have installed IIS after .Net 4)).

There are many references to this on the web, e.g. the MSDN blogs: http://blogs.msdn.com/b/webtopics/archive/2010/04/28/system-typeloadexception-for-system-servicemodel-activation-httpmodule-in-asp-net-4.aspx

The fix is to re-register ASP.Net 4 from the correct (32 or 64 bit) Framework folder (Framework64 on a 64bit server), using the aspnet_regiis.exe tool, e.g.

aspnet_regiis.exe -iru

Answer 3

For Windows 8 you need to Windows features and enable everything under .Net Framework 3.5 and .Net Framework 4.5 Advanced Services -> Enable Everything