java.lang.IllegalArgumentException: adding a window to a container

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    • java.lang.IllegalArgumentException: adding a window to a container at java.awt.Container.addImpl(Container.java:616) at javax.swing.JSplitPane.addImpl(JSplitPane.java:1006) at java.awt.Container.add(Container.java:518) at javax.swing.JSplitPane.setRightComponent(JSplitPane.java:495) at javax.swing.JSplitPane.<init>(JSplitPane.java:333) at com.test.TabbedPaneEx1.jbInit(TabbedPaneEx1.java:36) at com.test.TabbedPaneEx1.<init>(TabbedPaneEx1.java:27) at com.test.TabbedPaneEx1.main(TabbedPaneEx1.java:60)

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