java.lang.NullPointerException: This exception has no message.

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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)