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

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If you install DotNet framework 4.0 on IIS server and then enable DotNet 3.0 or 3.5 WCF features, you might see following error when browse your application site made of ASP.NET 4.0 (or run on ASP.NET 4.0 application pool).

Resolution:
  To resolve this issue, run the following from Visual Studio command prompt:
  aspnet_regiis.exe -iru

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