'System.Data.Objects.DataClasses.EntityObject' is defined in an assembly that is not referenced

I start a pet project using MVC3 +entity framework. When I query the entity I got the following errors.

The type ‘System.Data.Objects.DataClasses.EntityObject’ is defined in an assembly that is not referenced. You must add a reference to assembly ‘System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089′

I double checked my references in my project; System.Data.Entity is in my project references. After a bit Goggling, to solve this problem you need to add the assembly reference in the web.config. See the screen shot below:

 

    

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