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java.lang.NullPointerException at com.sun.java.swing.plaf.windows.WindowsButtonUI.getPreferredSize(WindowsButtonUI.java:123) at javax.swing.plaf.basic.BasicButtonUI.getMinimumSize(BasicButtonUI.java:382) at javax.swing.JComponent.getMinimumSize(JComponent.java:1356) at java.awt.GridBagLayout.GetLayoutInfo(GridBagLayout.java:894) at java.awt.GridBagLayout.getLayoutInfo(GridBagLayout.java:806) at java.awt.GridBagLayout.ArrangeGrid(GridBagLayout.java:1377) at java.awt.GridBagLayout.arrangeGrid(GridBagLayout.java:1336) at java.awt.GridBagLayout.layoutContainer(GridBagLayout.java:706) at java.awt.Container.layout(Container.java:1017) at java.awt.Container.doLayout(Container.java:1007) at java.awt.Container.validateTree(Container.java:1089)