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.

** or alternatively **

Are there any tutorials for binding EntityDataSource to web controls that actually work in VS 2012 SP1 without runtime errors?