I'm trying to implement claims authentication in to my site I have followed the tutorial shown here
Replacing Forms Authentication now from what I can see I have done everything correctly... so I thought, when I run my application enter my credentials I then try to set the Claim as shown here
[HttpPost]
    public ActionResult Register(UserRegister userRegister)
    {
        if (ModelState.IsValid)
        {
            var userProfile = new RegisterService().RegisterUser(userRegister);
            if (userProfile != null)
            {
                var userCredentials = new[] {
                new Claim("UserId", Convert.ToString(userProfile.UserId)),
                new Claim("UniqueId", Convert.ToString(userProfile.UniqueId)),
                new Claim("Username", Convert.ToString(userProfile.Username)),
                new Claim("Firstname", Convert.ToString(userProfile.Firstname)),
                new Claim("Surname", Convert.ToString(userProfile.Surname)),
                new Claim("Email", Convert.ToString(userProfile.EmailAddress))};
                var id = new ClaimsIdentity(userCredentials, "Forms");
                var cp = new ClaimsPrincipal(id);
                var token = new SessionSecurityToken(cp);
                var sam = FederatedAuthentication.SessionAuthenticationModule;
                sam.WriteSessionTokenToCookie(token);
                return RedirectToAction("UserProfile", "Profile", new { area = "Profile" });
            }
            else
            {
                TempData["error"] = "Something went wrong with your registration, plese check the details you entered and try again";
            }
        }
        return View(userRegister);
    }
But the Error I get is Object reference not set to an instance of an object. on the following line of the above
sam.WriteSessionTokenToCookie(token);
I'm not sure what exactly I'm doing wrong here, reason behind this is because I have another project again with claims authentication implemented successfully.
Any help would be beneficial.
Thanks
