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java.lang.NullPointerException: Children: child node is null: parent = AnchorPane@62baec	at javafx.scene.Parent$2.onProposedChange(Parent.java:435)	at com.sun.javafx.collections.VetoableListDecorator.addAll(VetoableListDecorator.java:234)	at com.sun.javafx.collections.VetoableListDecorator.addAll(VetoableListDecorator.java:103)	at javafxapplication1.JavaFXApplication1.addStaffRegLO(JavaFXApplication1.java:116)	at javafxapplication1.JavaFXApplication1.start(JavaFXApplication1.java:61)	at com.sun.javafx.application.LauncherImpl.lambda$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)