Entity Framework Is Incomplete

As I am studying the Entity Framework, I choose to build a simple console application with two tables that makes use of the framework.

Two tables have been made by me: http://wstaw.org/w/LrL/

I have classes that are appropriate for the database.

Here's the code:

The class of contacts.

public class Contact
{
     public int ContactID { get; set; }
     public string FirstName { get; set; }
     public string LastName { get; set; }
     public ICollection<Address> Addresses { get; set; }
}

the Address class, too.

public class Address
{
     public int AddressID { get; set; }
     public string Street { get; set; }
     public string City { get; set; }
}

VS displays the following errors.

Error 3 Missing partial modifier on declaration of type 'MyEntityPOCO.Contact'; another partial declaration of this type exists Contact.c 8 19 MyEntityPOCO

Error 4 Missing partial modifier on declaration of type 'MyEntityPOCO.Address'; another partial declaration of this type exists Address.cs 8 19 MyEntityPOCO

Error 1 Running transformation: Please overwrite the replacement token '$edmxInputFile$' with the actual name of the .edmx file you would like to generate from. MyEntityPOCO\Model1.tt 1 1

How can I fix these mistakes?