[ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object. at RDK.Controls.SubNodeCtrl.NumericUpDownValueChanged(Object sender, EventArgs e) at Rhino.UI.Controls.NumericUpDownWithUnitParsing.StopTextChanged() at Eto.Forms.UITimer.OnElapsed(EventArgs e) at Eto.Forms.UITimer.Callback.OnElapsed(UITimer widget, EventArgs e) at System.Windows.Threading.DispatcherTimer.FireTick(Object unused) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler) [END ERROR]