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SfScheduler page is crashing my app once it appears. i am using android 10 device.
private async void InitializeSchedule(){try{Application.Current.MainPage.IsBusy = true;Application.Current.MainPage.IsEnabled = false;var result = await App.chatService.ReadSchedule();viewModel = new SchedulePageViewModel();viewModel.Parse(result);schedule = new SfSchedule();schedule.MonthInlineAppointmentTapped += Schedule_MonthInlineAppointmentTapped;schedule.ShowResourceView = true;schedule.ScheduleView = ScheduleView.MonthView;schedule.AppointmentMapping = new ScheduleAppointmentMapping{SubjectMapping = "Subject",ColorMapping = "Color",StartTimeMapping = "StartTime",EndTimeMapping = "EndTime",ResourceIdsMapping = "ResourceIds",RecurrenceRuleMapping = "RecurrenceRule",};schedule.ResourceMapping = new ResourceMapping{Name = "Name",Id = "ID",Color = "Color",};schedule.MonthViewSettings.ShowAgendaView = true;schedule.ResourceViewSettings.SelectionMode = Syncfusion.SfSchedule.XForms.SelectionMode.Multiple;this.schedule.SuspendAppointmentUpdate();schedule.DataSource = viewModel.Appointments;schedule.ScheduleResources = viewModel.Resources;schedule.SelectedResources = viewModel.SelectedResources;this.schedule.ResumeAppointmentUpdate();MainThread.BeginInvokeOnMainThread(() =>{scheduleView.Content = schedule;});}catch (Exception ex){var action = await this.DisplayActionSheet("Error", "Cancel", ex.Message, "Retry");if (action == "Retry"){InitializeSchedule();}}finally{Application.Current.MainPage.IsBusy = false;Application.Current.MainPage.IsEnabled = true;}}
i am calling this method from SchedulePage_Appearing event of this page. and sometimes not always. it crashes my app after appearing. with this error
can you help please?msg: android.runtime.JavaProxyThrowable: System.InvalidOperationException: Sequence contains no elements at System.Linq.Enumerable.First[TSource] (System.Collections.Generic.IEnumerable`1[T] source) [0x00010] in <45fb8fb0007e43838318c5766136e6bd>:0 at Com.Syncfusion.Schedule.AppointmentEngine.GetVisibleAppointments (System.Collections.ObjectModel.ObservableCollection`1[T] visibleDateRange, Com.Syncfusion.Schedule.ScheduleAppointmentCollection appointments, System.Boolean isTimelineView, System.Boolean isLeftsideResource) [0x0000e] in <36a3cbfd8a6f4836a968c5a776f3511a>:0 at Com.Syncfusion.Schedule.SfSchedule.<UpdateResourceAppointments>b__323_0 () [0x00042] in <36a3cbfd8a6f4836a968c5a776f3511a>:0 at System.Threading.Tasks.Task.InnerInvoke () [0x0000f] in <9a7f37f8b53d493eb264b2e0d3b2956a>:0 at System.Threading.Tasks.Task.Execute () [0x00000] in <9a7f37f8b53d493eb264b2e0d3b2956a>:0 --- End of stack trace from previous location where exception was thrown --- at Com.Syncfusion.Schedule.SfSchedule.UpdateResourceAppointments (System.Collections.ObjectModel.ObservableCollection`1[T] resourceIDColl) [0x000ac] in <36a3cbfd8a6f4836a968c5a776f3511a>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__7_0 (System.Object state) [0x00000] in <9a7f37f8b53d493eb264b2e0d3b2956a>:0 at Android.App.SyncContext+<>c__DisplayClass2_0.<Post>b__0 () [0x00000] in <985f5179c1dd4b3b98fb1b8dcc1ee9be>:0 at Java.Lang.Thread+RunnableImplementor.Run () [0x00008] in <985f5179c1dd4b3b98fb1b8dcc1ee9be>:0 at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00009] in <985f5179c1dd4b3b98fb1b8dcc1ee9be>:0 at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.28(intptr,intptr) stacktrace: android.runtime.JavaProxyThrowable: System.InvalidOperationException: Sequence contains no elements at System.Linq.Enumerable.First[TSource] (System.Collections.Generic.IEnumerable`1[T] source) [0x00010] in <45fb8fb0007e43838318c5766136e6bd>:0 at Com.Syncfusion.Schedule.AppointmentEngine.GetVisibleAppointments (System.Collections.ObjectModel.ObservableCollection`1[T] visibleDateRange, Com.Syncfusion.Schedule.ScheduleAppointmentCollection appointments, System.Boolean isTimelineView, System.Boolean isLeftsideResource) [0x0000e] in <36a3cbfd8a6f4836a968c5a776f3511a>:0 at Com.Syncfusion.Schedule.SfSchedule.<UpdateResourceAppointments>b__323_0 () [0x00042] in <36a3cbfd8a6f4836a968c5a776f3511a>:0 at System.Threading.Tasks.Task.InnerInvoke () [0x0000f] in <9a7f37f8b53d493eb264b2e0d3b2956a>:0 at System.Threading.Tasks.Task.Execute () [0x00000] in <9a7f37f8b53d493eb264b2e0d3b2956a>:0 --- End of stack trace from previous location where exception was thrown --- at Com.Syncfusion.Schedule.SfSchedule.UpdateResourceAppointments (System.Collections.ObjectModel.ObservableCollection`1[T] resourceIDColl) [0x000ac] in <36a3cbfd8a6f4836a968c5a776f3511a>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__7_0 (System.Object state) [0x00000] in <9a7f37f8b53d493eb264b2e0d3b2956a>:0 at Android.App.SyncContext+<>c__DisplayClass2_0.<Post>b__0 () [0x00000] in <985f5179c1dd4b3b98fb1b8dcc1ee9be>:0 at Java.Lang.Thread+RunnableImplementor.Run () [0x00008] in <985f5179c1dd4b3b98fb1b8dcc1ee9be>:0 at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00009] in <985f5179c1dd4b3b98fb1b8dcc1ee9be>:0 at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.28(intptr,intptr) at mono.java.lang.RunnableImplementor.n_run(Native Method) at mono.java.lang.RunnableImplementor.run(RunnableImplementor.java:30) at android.os.Handler.handleCallback(Handler.java:883) at android.os.Handler.dispatchMessage(Handler.java:100) at android.os.Looper.loop(Looper.java:214) at android.app.ActivityThread.main(ActivityThread.java:7356) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
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