Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly 'System.ServiceModel


Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly 'System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

Today when I configured IIS on Windows 7 machine, my all websites displayed titled error, when I googled the fix then I got following that fixed my error.

This can typically happen when you installed 4.0 first and then enabled 3.0 HTTP Activation later.
Navigate to following path:-

C:\Windows\System32\inetsrv\config

This issue is usually caused because the app's host config (applicationHost.config) has the following incorrectly defined section:

<add name="ServiceModel" type="System.ServiceModel.Activation.HttpModule, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" preCondition="managedHandler" />

This should be:

<add name="ServiceModel" type="System.ServiceModel.Activation.HttpModule, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" preCondition="managedHandler,runtimeVersionv2.0" />

I hope this post will help you to fix your machine error.

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