B4J Question jFXtrasGauges library

Hi,

The following error occurred when I tried the above library

Waiting for debugger to connect...
Program started.
Error occurred on line: 58 (Main)
java.lang.IllegalArgumentException: EventType "javafx.event.EventType@6bb4a9"with parent "EVENT" already exists
at javafx.event.EventType.register(EventType.java:186)
at javafx.event.EventType.<init>(EventType.java:128)
at javafx.event.EventType.<init>(EventType.java:83)
at jfxtras.labs.scene.control.gauge.GaugeModel$GaugeModelEvent.<init>(GaugeModel.java:760)
at jfxtras.labs.scene.control.gauge.GaugeModel.fireGaugeModelEvent(GaugeModel.java:159)
at jfxtras.labs.scene.control.gauge.GaugeModel.setThreshold(GaugeModel.java:333)
at jfxtras.labs.scene.control.gauge.Gauge.setThreshold(Gauge.java:633)
at anywheresoftware.b4j.agraham.jfxtrascontrols.BatteryWrapper$LcdWrapper.innerInitialize(BatteryWrapper.java:566)
at anywheresoftware.b4j.objects.NodeWrapper.Initialize(NodeWrapper.java:76)
at b4j.example.main._appstart(main.java:243)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:613)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:231)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:159)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:90)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:93)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:77)
at b4j.example.main.start(main.java:38)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$163(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$176(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$174(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$175(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$149(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)