Url.Action giver nullreference, bliver kaldt ude af context.

Hej.

Jeg har en MailController, som bliver kaldt fra en anden controller, men min Url.Action smider en nullreference.

Eksempel:

Bruger opretter sig, SendWelcomeMail bliver kaldet:

        public void SendWelcomeMail(string toMail)
        {
            StringBuilder sResult = new StringBuilder();
            XmlDocument xDoc = new XmlDocument();
            xDoc.Load(ConfigurationManager.AppSettings["mapToMail"] + "wCustomer.xml");
            string subject = xDoc.GetElementsByTagName("subject")[0].InnerText;
            StringBuilder body = new StringBuilder();
            body.Append(xDoc.GetElementsByTagName("body")[0].InnerText);
            body.Replace("\n", "<br />");
            body.Replace("", "<i>");
            body.Replace("", "</i>");
            body.Replace("[", "<");
            body.Replace("]", ">");
            body.Replace("%HOWITWORKS%", Url.Action("FAQ","Home"));

            SendMail(toMail, subject, body.ToString());
        }