Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly
It is quite often that developer encounter the following error when creating WCF application in IIS 7. Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly 'System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. Resolution : goto your Microsoft.NET Framework folder and run aspnet_regiis /iru The switch /iru - Reinstall this version of ASP.Net without forcing existing application to use this version. More information from this link .