Could not load type 'System.Web.Http.Dependencies.IDependencyScope'

I am working on one Asp.Net WebApi project along with 5 members in my team. We are using
Asp.net MVC4  Beta for the WebApi project. Everything is working for me fine. Suddenly one day I got the latest version of code from TFS and try to run the application. The solution build succeed, but the application throwing the following exception.

Could not load type 'System.Web.Http.Dependencies.IDependencyScope' from assembly 'System.Web.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'

The same application is running in my other teammates. I researched around one day, but did not found any solution that why this dll is not loading run time even though the dll is present in the bin folder.  One of my team mate told that Asp.Net MVC4 is updated from beta to release version. I updated that in my system then the application is working fine. There was mismatch in the team communicatin about this updatation I lost my one day. If any one get this exception try to update the WebApi to release candidate.