WCF Type 'System.CodeDom.Compiler.GeneratedCodeAttribute' is not defined

I am following this tutorial that shows how to implement a WCF authentication Service. I have done exactly step by step as detailed. But after adding all the proxy classes when I try to build the project, it gives me some 68 Errors and few are listed below. I don't know what I am doing wrong here. Clearly I think I am missing some Imports in my class or some attribute in app.config file. I may be wrong.

Type 'System.CodeDom.Compiler.GeneratedCodeAttribute' is not defined.
Type 'System.ServiceModel.ServiceContractAttribute' is not defined.
Type 'System.ServiceModel.OperationCont开发者_如何学CractAttribute' is not defined.
Type 'System.ServiceModel.EndpointAddress' is not defined.

All the three application services(authentication, Roles, Profile services) compile appropriately as shown in the walkthrough article. I was trying to build Single-Sign on Mechanism through WCF Authentication service.

Thanks in Advance.

Have you add reference to system.ServiceModel?

Are you compiling for at least .NET 3.0? If your build target is .NET 2.0 the types won't be defined