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

If you get

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

error trying to access a webservice in .net framework 4.0 or 4.5 it is caused by a conflict between 3.0 and 4.0 version.

Fortunately you can fix it in a per application basis. You have only to go to IIS Manager, select your application, double click in modules and delete ServiceModel version 3.0 module. 

If you need version 3.0 again or delete 4.0 accidentally you can fix it adding the module again, using the strings below to register the asemblies.

ServiceModel - System.ServiceModel.Activation.HttpModule, System.ServiceModel, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089

ServiceModel-4.0 - System.ServiceModel.Activation.ServiceHttpModule, System.ServiceModel.Activation, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35

Enjoy :)


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