System.ArgumentOutOfRangeException: The added or subtracted value results in an un-representable DateTime. (Parameter 'value')
   at System.DateTime.ThrowDateArithmetic(Int32 param)
   at System.DateTime.AddDays(Double value)
   at ClassIsland.Controls.ScheduleDataGrid.ScheduleDataGrid.RefreshWeekScheduleRows(Boolean changeFromDate) in /_/ClassIsland/Controls/ScheduleDataGrid/ScheduleDataGrid.axaml.cs:line 277
   at ClassIsland.Controls.ScheduleDataGrid.ScheduleDataGrid.ButtonNextWeek_OnClick(Object sender, RoutedEventArgs e) in /_/ClassIsland/Controls/ScheduleDataGrid/ScheduleDataGrid.axaml.cs:line 233
   at Avalonia.Interactivity.EventRoute.RaiseEventImpl(RoutedEventArgs e)
   at Avalonia.Interactivity.EventRoute.RaiseEvent(Interactive source, RoutedEventArgs e)
   at Avalonia.Interactivity.Interactive.RaiseEvent(RoutedEventArgs e)
   at Avalonia.Controls.Button.OnClick()
   at Avalonia.Controls.Button.OnPointerReleased(PointerReleasedEventArgs e)
   at Avalonia.Reactive.LightweightObservableBase`1.PublishNext(T value)
   at Avalonia.Interactivity.EventRoute.RaiseEventImpl(RoutedEventArgs e)
   at Avalonia.Interactivity.EventRoute.RaiseEvent(Interactive source, RoutedEventArgs e)
   at Avalonia.Interactivity.Interactive.RaiseEvent(RoutedEventArgs e)
   at Avalonia.Input.MouseDevice.MouseUp(IMouseDevice device, UInt64 timestamp, IInputRoot root, Point p, PointerPointProperties props, KeyModifiers inputModifiers, IInputElement hitTest)
   at Avalonia.Input.MouseDevice.ProcessRawEvent(RawPointerEventArgs e)
   at Avalonia.Controls.TopLevel.<>c.<HandleInput>b__150_0(Object state)
   at Avalonia.Threading.Dispatcher.Send(SendOrPostCallback action, Object arg, Nullable`1 priority)