Anti-forgery token issues

I am having an issue with the anti-forgery token :( I have created my own User class which worked fine but now I am getting an error whenever I go to the /Account/Register page. The error is:

A claim of type 'http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier' or 'http://schemas.microsoft.com/accesscontrolservice/2010/07/claims/identityprovider' was not present on the provided ClaimsIdentity. To enable anti-forgery token support with claims-based authentication, please verify that the configured claims provider is providing both of these claims on the ClaimsIdentity instances it generates. If the configured claims provider instead uses a different claim type as a unique identifier, it can be configured by setting the static property AntiForgeryConfig.UniqueClaimTypeIdentifier.

I found this article:

http://stack247.wordpress.com/2013/02/22/antiforgerytoken-a-claim-of-type-nameidentifier-or-identityprovider-was-not-present-on-provided-claimsidentity/

so I changed my Application_Start method to this:

protected void Application_Start()
{
    AreaRegistration.RegisterAllAreas();

    FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
    RouteConfig.RegisterRoutes(RouteTable.Routes);
    BundleConfig.RegisterBundles(BundleTable.Bundles);

    AntiForgeryConfig.UniqueClaimTypeIdentifier = ClaimTypes.Email;
}

but when I do that, I get this error:

A claim of type 'http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress' was not present on the provided ClaimsIdentity.

Has anyone come across this before? If so, do you know how to solve it?

Here is my custom user class:

public class Profile : User, IProfile
{
    public Profile()
        : base()
    {
        this.LastLoginDate = DateTime.UtcNow;
        this.DateCreated = DateTime.UtcNow;
    }

    public Profile(string userName)
        : base(userName)
    {
        this.CreatedBy = this.Id;

        this.LastLoginDate = DateTime.UtcNow;
        this.DateCreated = DateTime.UtcNow;

        this.IsApproved = true;
    }
    
    [NotMapped]
    public HttpPostedFileBase File { get; set; }

    [Required]
    public string CompanyId { get; set; }

    [Required]
    public string CreatedBy { get; set; }
    public string ModifiedBy { get; set; }

    public DateTime DateCreated { get; set; }
    public DateTime? DateModified { get; set; }
    public DateTime LastLoginDate { get; set; }

    [Required(ErrorMessageResourceType = typeof(Resources.Resources), ErrorMessageResourceName = "RequiredTitle")]
    public string Title { get; set; }
    [Required(ErrorMessageResourceType = typeof(Resources.Resources), ErrorMessageResourceName = "RequiredFirstName")]
    public string Forename { get; set; }
    [Required(ErrorMessageResourceType = typeof(Resources.Resources), ErrorMessageResourceName = "RequiredLastName")]
    public string Surname { get; set; }

    [Required(ErrorMessageResourceType = typeof(Resources.Resources), ErrorMessageResourceName = "RequiredEmail")]
    public string Email { get; set; }
    public string JobTitle { get; set; }
    public string Telephone { get; set; }
    public string Mobile { get; set; }
    public string Photo { get; set; }
    public string LinkedIn { get; set; }
    public string Twitter { get; set; }
    public string Facebook { get; set; }
    public string Google { get; set; }
    public string Bio { get; set; }

    public string CompanyName { get; set; }

    [Required(ErrorMessageResourceType = typeof(Resources.Resources), ErrorMessageResourceName = "RequiredCredentialId")]
    public string CredentialId { get; set; }
    [Required(ErrorMessageResourceType = typeof(Resources.Resources), ErrorMessageResourceName = "RequiredSecurityCode")]
    public bool IsLockedOut { get; set; }
    public bool IsApproved { get; set; }

    [Display(Name = "Can only edit own assets")]
    public bool CanEditOwn { get; set; }
    [Display(Name = "Can edit assets")]
    public bool CanEdit { get; set; }
    [Display(Name = "Can download assets")]
    public bool CanDownload { get; set; }
    [Display(Name = "Require approval to upload assets")]
    public bool RequiresApproval { get; set; }
    [Display(Name = "Can approve assets")]
    public bool CanApprove { get; set; }
    [Display(Name = "Can synchronise assets")]
    public bool CanSync { get; set; }

    public bool AgreedTerms { get; set; }
    public bool Deleted { get; set; }
}

public class ProfileContext : IdentityStoreContext
{
    public ProfileContext(DbContext db)
        : base(db)
    {
        this.Users = new UserStore<Profile>(this.DbContext);
    }
}

public class ProfileDbContext : IdentityDbContext<Profile, UserClaim, UserSecret, UserLogin, Role, UserRole>
{
}

I profile is just simple for my repositories, looks like this:

public interface IProfile
{
    string Id { get; set; }
    string CompanyId { get; set; }
    
    string UserName { get; set; }
    string Email { get; set; }

    string CredentialId { get; set; }
}

and the User class is the Microsoft.AspNet.Identity.EntityFramework.User class. My AccountController looks like this:

[Authorize]
public class AccountController : Controller
{
    public IdentityStoreManager IdentityStore { get; private set; }
    public IdentityAuthenticationManager AuthenticationManager { get; private set; }
    
    public AccountController() 
    {
        this.IdentityStore = new IdentityStoreManager(new ProfileContext(new ProfileDbContext()));
        this.AuthenticationManager = new IdentityAuthenticationManager(this.IdentityStore);
    }

    //
    // GET: /Account/Register
    [AllowAnonymous]
    public ActionResult Register()
    {
        return View();
    }

    //
    // POST: /Account/Register
    [HttpPost]
    [AllowAnonymous]
    public async Task<ActionResult> Register(RegisterViewModel model)
    {
        if (ModelState.IsValid)
        {
            try
            {
                // Create a profile, password, and link the local login before signing in the user
                var companyId = Guid.NewGuid().ToString();
                var user = new Profile(model.UserName)
                {
                    CompanyId = companyId,
                    Title = model.Title,
                    Forename = model.Forename,
                    Surname = model.Surname,
                    Email = model.Email,
                    CompanyName = model.CompanyName,
                    CredentialId = model.CredentialId
                };

                if (await IdentityStore.CreateLocalUser(user, model.Password))
                {
                    //Create our company
                    var company = new Skipstone.Web.Models.Company()
                    {
                        Id = companyId,
                        CreatedBy = user.Id,
                        ModifiedBy = user.Id,
                        Name = model.CompanyName
                    };

                    using (var service = new CompanyService())
                    {
                        service.Save(company);
                    }

                    await AuthenticationManager.SignIn(HttpContext, user.Id, isPersistent: false);
                    return RedirectToAction("Setup", new { id = companyId });
                }
                else
                {
                    ModelState.AddModelError("", "Failed to register user name: " + model.UserName);
                }
            }
            catch (IdentityException e)
            {
                ModelState.AddModelError("", e.Message);
            }
        }

        // If we got this far, something failed, redisplay form
        return View(model);
    }

    //
    // POST: /Account/Setup
    public ActionResult Setup(string id)
    {
        var userId = User.Identity.GetUserId();
        using (var service = new CompanyService())
        {
            var company = service.Get(id);
            var profile = new Profile()
            {
                Id = userId,
                CompanyId = id
            };

            service.Setup(profile);

            return View(company);
        }
    }
}

It used to be decorated with the [ValidateAntiForgeryToken] attribute, but that is where it stopped working.

Why?