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focusCycleRoot is not a focus cyle root of aComponent
java.lang.IllegalArgumentException: focusCycleRoot is not a focus cyle root of aComponent	at java.awt.ContainerOrderFocusTraversalPolicy.getComponentAfter(ContainerOrderFocusTraversalPolicy.java:68)	at javax.swing.LegacyGlueFocusTraversalPolicy.getComponentAfter(LegacyGlueFocusTraversalPolicy.java:63)	at java.awt.Component.nextFocusHelper(Component.java:6156)	at java.awt.Container.nextFocusHelper(Container.java:2342)	at java.awt.Component.removeNotify(Component.java:5436)	at java.awt.Container.removeNotify(Container.java:2028)	at javax.swing.JComponent.removeNotify(JComponent.java:4286)	at javax.swing.text.JTextComponent.removeNotify(JTextComponent.java:1317)	at java.awt.Container.removeNotify(Container.java:2023)	at javax.swing.JComponent.removeNotify(JComponent.java:4286)	at java.awt.Container.removeNotify(Container.java:2023)	at javax.swing.JComponent.removeNotify(JComponent.java:4286)	at java.awt.Container.remove(Container.java:676)	at javax.swing.JSplitPane.remove(JSplitPane.java:892)	at java.awt.Container.remove(Container.java:729)	at javax.swing.JSplitPane.remove(JSplitPane.java:867)	at javax.swing.JSplitPane.addImpl(JSplitPane.java:996)	at java.awt.Container.add(Container.java:490)	at javax.swing.JSplitPane.setRightComponent(JSplitPane.java:495)