Could not find the CLR type for ''

I am using Visual Studio 2012 SP1. 
I have this problem :-
http://erikej.blogspot.com.au/2011/01/entity-framework-with-sql-server.html
When trying to follow the tutorials regarding binding an EntityDataSource to a web control. 
I just get Could not find the CLR type for 'RegulatoryAffairsModel.CBCodesImport'.
To be quite frank, is there an easy way around this? 
Or do I have to learn what POCO is, and learn about lazy loading... etc etc I mean come on!

I don't have weeks to get a simple tutorial happening.
I have not added a single line of custom code. 
Can anyone explain any easy way around this problem - so the basic ASP.NET tutorials work? Or is there versioning issues etc..
I don't understand why it is so hard.

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