Upgraded to 2014 - Getting error

Hi

I have recently upgraded my SQL server to 2014 express from 2012. I coped out a database .mdf so that i could attach it after. It attaches ok and i can view the database inside SQL server no problem but whwn i make a data connection to it through visual studio 2013, i get this error-

During the Data connection wizard, i click "Test Connection" and it succeeds just fine. Im guessing it somethingto do with 2014 being Version 12 and my database being version 11.

How can i get this database connection to work?

Thanks

Nigel

Nacho is the derivative of Nigel "True fact!"