AssemblyVersion:7.3.1

PortalID:0

PortalName:My Website

UserID:1

UserName:ckloong

ActiveTabID:88

ActiveTabName:Calendar Booking

RawURL:/Calendar-Booking/ctl/AddEvent/mid/416?popUp=true&start=2014/7/31&end=2014/7/31

AbsoluteURL:/Default.aspx

AbsoluteURLReferrer:http://dnndev.me/Calendar-Booking/ctl/AddEvent/mid/416?popUp=true&start=2014/7/31&end=2014/7/31

UserAgent:Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko

DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke

ExceptionGUID:db9de8d7-d5d0-493c-8d6d-1551e9ddffcb

InnerException:Object reference not set to an instance of an object.

FileName:

FileLineNumber:0

FileColumnNumber:0

Method:DotNetNuke.Services.Social.Notifications.NotificationsController.<SendNotification>b__8

StackTrace:

Message:

DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at DotNetNuke.Services.Social.Notifications.NotificationsController.<SendNotification>b__8(UserInfo user)
   at System.Linq.Enumerable.WhereListIterator`1.MoveNext()
   at DotNetNuke.Services.Social.Notifications.NotificationsController.SendNotification(Notification notification, Int32 portalId, IList`1 roles, IList`1 users)
   at Tverve.AddEvent.btntest_Click(Object sender, EventArgs e) in d:\DotNetNuke\DesktopModules\FullCalendar\AddEvent.ascx.cs:line 81
   at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   --- End of inner exception stack trace ---

Source:

i cant understand why my Notification will have this error, when i apply on a button. did i do anything wrong ? im still new for DNN.

protected void btntest_Click(object sender, EventArgs e)

        {

            var notificationType = NotificationsController.Instance.GetNotificationType("HtmlNotification");

            var portalSettings = PortalController.Instance.GetCurrentPortalSettings();

            var sennder = UserController.GetUserById(portalSettings.PortalId, portalSettings.AdministratorId);

            var notification = new Notification { NotificationTypeID = notificationType.NotificationTypeId, Subject = subject, Body = body, IncludeDismissAction = true, SenderUserID = sennder.UserID, To= Convert.ToString(UserInfo.UserID)};

            NotificationsController.Instance.SendNotification(notification, PortalSettings.PortalId, null, new List<UserInfo>{user});

        }