java.lang.NullPointerException

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    • java.lang.NullPointerException at javax.swing.plaf.basic.BasicTabbedPaneUI$TabbedPaneLayout.calculateSize(BasicTabbedPaneUI.java:1293) at javax.swing.plaf.basic.BasicTabbedPaneUI$TabbedPaneLayout.preferredLayoutSize(BasicTabbedPaneUI.java:1272) at java.awt.Container.preferredSize(Container.java:836) at java.awt.Container.getPreferredSize(Container.java:820) at javax.swing.JComponent.getPreferredSize(JComponent.java:1044)
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