That looks like a version mismatch somewhere.
Make sure you're using the latest sample - http://nakedobjects.codeplex.com/releases/view/95597 - I've just tried this out and it all runs OK.
- extract to a directory
- add a .nuget directory with nuget.exe and nuget.targets at at same level as .sln
- open in VS and build
- run RunMVC
Your nakedObjects packages should all be 5.0.0 except the Ide (4.2.0). Don't forget you'll need the AdventureWorks example database.