Error The model backing the 'InternalRoleContext`3' context has changed since the database was created

Jun 2, 2013 at 7:18 AM
Edited Jun 2, 2013 at 8:19 AM
Hello everyone.
I start learning the EF Membership. I download the example from https://efmembership.codeplex.com/. I put in some setting connection string, for sql Server in sample1 or sample2, and I have a error.

__The model backing the 'InternalRoleContext`3' context has changed since the database was created. Consider using Code First Migrations to update the database (http://go.microsoft.com/fwlink/?LinkId=238269)__

I guess what I must create migration, but I don't understand where my dbContext type for it.

Thanks