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java.lang.NullPointerException: 	at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2289)	at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2419)	at com.sun.javafx.tk.Toolkit.lambda$runPulse$30(Toolkit.java:355)	at java.security.AccessController.doPrivileged(Native Method)	at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:354)	at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:381)	at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:510)	at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:490)	at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$404(QuantumToolkit.java:319)	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)	at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)	at java.lang.Thread.run(Thread.java:745)