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

Question

When browsing to the SELECTserver Administration site, the site displays an error 
 Server error in /BSS application 
 Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly 'System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089

Phil Conard · Accepted Answer

From the Start menu, choose All Programs, and then choose Accessories.Right-click Command Prompt, and then choose Run as administrator. 
 At the command prompt, type the following command to change to the Microsoft.NET\Framework64\v4.0.30319 folder, and then press Enter. cd\Windows\Microsoft.NET\Framework64\v4.0.30319 
 At the command prompt, type the following command, and then press Enter. aspnet_regiis.exe -iru 
 At the command prompt, type the following command, and then press Enter. iisreset 
 
 This error can occur when there are multiple versions of the .NET Framework on the computer that is running IIS, and IIS was installed after .NET Framework 4.0 or before .NET 4.0 was registered.