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