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Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly 'System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
Cause: na
Resolution:
To resolve this issue, run the following command line:
1. Right click on Command Prompt - select run as administrator
2. type in this for 64 bit computer:  cd C:\Windows\Microsoft.NET\Framework64\v4.0.30319
or
cd %windir%\Microsoft.NET\Framework\v4.0.30319
3. right click to paste in this:
aspnet_regiis.exe /iru