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

This is caused when 4.0 components are not properly installed on the IIS Server. To resolve it, you can run this command:
>aspnet_regiis.exe –iru

That exe is found here:

  • 32-bit systems: %SystemRoot%\Microsoft.NET\Framework\v4.0.30319
  • 64-bit systems: %SystemRoot%\Microsoft.NET\Framework64\v4.0.30319

About esteban

Esteban is the Founder and Chief Technologist at Nebbia Technology, an ALM consulting and Azure-powered technology company. He is a software developer with a passion for ALM, TFS, Azure, and software development best practices. Esteban is a Microsoft Visual Studio ALM MVP and ALM Ranger, Pluralsight author, and the president of ONETUG (Orlando .NET User Group).

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