Timer error Java lang.IllegalStateException

I tried to display a tag in JRE 8, saying that everything is only 3 seconds, because I can't use datepicker in JRE 7, and I found this error

Exception in thread "Timer-2" java.lang.IllegalStateException: Not on FX application thread; currentThread = Timer-2
at com.sun.javafx.tk.Toolkit.checkFxUserThread(UnkNown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(UnkNown Source)
at javafx.scene.Scene.addToDirtyList(UnkNown Source)
at javafx.scene.Node.addToSceneDirtyList(UnkNown Source)
at javafx.scene.Node.impl_markDirty(UnkNown Source)
at javafx.scene.Node$7.invalidated(UnkNown Source)
at javafx.beans.property.BooleanPropertyBase.markInvalid(UnkNown Source)
at javafx.beans.property.BooleanPropertyBase.set(UnkNown Source)
at javafx.css.StyleableBooleanProperty.set(UnkNown Source)
at javafx.scene.Node.setVisible(UnkNown Source)
at Pantallas.PersonalContabilidad$1.run(PersonalContabilidad.java:221)
at java.util.TimerThread.mainLoop(UnkNown Source)
at java.util.TimerThread.run(UnkNown Source)

The correct is a label, I show it for 3 seconds, it's in correct Setvisible (false) failed; This is line 221

correct.setVisible(true);
    timer.schedule(new TimerTask() {
    @Override
        public void run() {
        correct.setVisible(false);
    }
    },3*1000);

Solution

The correct tag should be updated from the FX application thread You should use the platform here runLater().

correct.setVisible(true);
timer.schedule(new TimerTask() {
@Override
    public void run() {
    Platform.runLater(new Runnable() {
       public void run() {
          correct.setVisible(false);
      }
    });
}
},3*1000);