I inherited a DNN site that was developed by a third party.  While I was trying to upgrade the core DNN (from 4.9.5 to 5.2.3, on our way to 6.2.2), the custom container they developed broke.  It seems to be fine to the user, but when I try to login as an admin, I get an "object reference not found" on the line that sets the module title (bolded).  When I peek at it in the VS2010, there is a warning that PortalModule is obsolete on the declaration in italics.  I am not sure how to fix this (not real up to speed on the DNN object model).  Thanks for any help in advance and can send any supporting code.

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using DotNetNuke.Entities.Modules;
using DotNetNuke.Entities.Portals;

namespace ISITE.Skins
{
    public partial class container : DotNetNuke.UI.Containers.Container
    {
        string _extraClass = null;
        protected string ExtraClass { get { return _extraClass; } }

        protected void Page_PreRender(object sender, EventArgs e)
        {            
            PortalSettings portalSettings = PortalController.GetCurrentPortalSettings();
            bool isAdminEdit = (DotNetNuke.Security.PortalSecurity.IsInRole(portalSettings.AdministratorRoleName)
                && portalSettings.UserMode == PortalSettings.Mode.Edit);
            
            phAdminTop.Visible = isAdminEdit;
            phAdminBottom.Visible = isAdminEdit;
            PortalModuleBase portalModule = dnnACTIONS.PortalModule;
                
            if (isAdminEdit == true)
            {
                string title = string.Empty;
                if (portalModule != null)
                {
                    title = portalModule.ModuleConfiguration.ModuleTitle;
                    if (string.IsNullOrEmpty(title) == true)
                        title = portalModule.ModuleConfiguration.ModuleName;
                }
                if (string.IsNullOrEmpty(title) == true)
                    litTitle.Text = string.Empty;
                else
                    litTitle.Text = (litTitle.Text.Contains("{0}") == true)
                        ? string.Format(litTitle.Text, title)
                        : title;
            }
            else if (portalModule is ISITEPortalModule)
            {
                this.Visible = (((ISITEPortalModule)portalModule).HideContent == false);
            }
            if (portalModule != null)
                _extraClass = ModuleSettingCollection.Get(portalModule.ModuleId)["containerclass"];
        }
        
    }
}