Complete error message:
Object reference not set to an instance of an object. / Syncfusion.SfSchedule.WinRT / -2147467261 / at Syncfusion.UI.Xaml.Schedule.SfSchedule.Add(DateTime key, ScheduleAppointment thing)
at Syncfusion.UI.Xaml.Schedule.SfSchedule.Appointments_CollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.InsertItem(Int32 index, T item)
at System.Collections.ObjectModel.Collection`1.Add(T item)
at SOLuxe.View.Agenda.AgendaPage.LoadAppointements()