ApplicationUser is not part of the model for the context

I'm trying to put Asp.net identity context to a class library that provides data access using entity framework edmx.

But it gives an error such; The entity type ApplicationUser is not part of the model for the current context.

Here is db context class;

public class ApplicationUser : IdentityUser
{
public async Task GenerateUserIdentityAsync(UserManager manager)
{
// Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
// Add custom user claims here
return userIdentity;
}
}
public partial class AppDbContext : IdentityDbContext
{
public AppDbContext ()
: base("name=AppDbContext")
{
}
public static AppDbContext Create()
{
return new AppDbContext();
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
throw new UnintentionalCodeFirstException();
}
//public virtual DbSet AspNetRoles { get; set; }
//public virtual DbSet AspNetUserClaims { get; set; }
//public virtual DbSet AspNetUserLogins { get; set; }
//public virtual DbSet AspNetUsers { get; set; }
}