Good morning,

I need to create a webservice, it must be located out of dnn installation (I can´t use Iweb). I would like to use dnn classes.
In one webmethod, I have to create users. In bin folder, I've added all dnn dll's

[WebMethod]
        public bool Alta_Colegiado(string dni, string password, string idColegiado, string email, string display_name,string telefono)
        {
            int PortalID_const = 0;
            int RolID_const=1;
            try
            {
               
                    UserInfo objUserDnn = new UserInfo();
                    //objUserDnn.Profile.InitialiseProfile(PortalID_const);
                    objUserDnn.PortalID = PortalID_const;
                    objUserDnn.Membership.Username = dni;
                    objUserDnn.FirstName = idColegiado;
                    objUserDnn.Membership.Password = decodificar(password);
                    objUserDnn.Membership.Email = email;
                    objUserDnn.Membership.Approved = true;
                    objUserDnn.Username = dni;

                    objUserDnn.Profile.PreferredLocale = "es-ES";
                    objUserDnn.DisplayName = display_name;
                    objUserDnn.Email = email;
                    objUserDnn.AffiliateID = 0;
                    objUserDnn.Profile.Telephone=telefono;                           

                    UserCreateStatus objUserCreateStatus= UserController.CreateUser(ref objUserDnn);

                    if (objUserCreateStatus == UserCreateStatus.Success)
                    {
                        RoleController rc = new RoleController();
                        rc.AddUserRole(PortalID_const,objUserDnn.UserID,RolID_const,DateTime.Parse("31/12/2090"));
                        return true;
                    }
                    else
                        return false;
                   
               
            }
            catch (Exception e)
            {               
                FicheroRegistro fich_reg = (FicheroRegistro)Application["FicheroRegistro"];
                lock (fich_reg)
                {
                    fich_reg.Escribir(e.Message.Replace("\r\n", "\r\n\t"));
                }
                return false;           
            }
        }

using lines:

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Web.Security;
using Interesa.Architecture.BCL.Extranet;
using ws.coiina.es.des.Util;
using System.Web.UI;
using DotNetNuke.Entities.Users;
using DotNetNuke.Security.Membership;
using DotNetNuke.Security.Roles;

This line:

UserCreateStatus objUserCreateStatus= UserController.CreateUser(ref objUserDnn);

throw one exception (nullreferenceexception)

Can you help me???
How should the webconfig file be?