java.lang.NullPointerException

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  • help me. an error occured.........
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  • JSplitPane in JInternalFrame
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    • java.lang.NullPointerException at java.awt.dnd.DropTarget.addNotify(DropTarget.java:431) at java.awt.Component.addNotify(Component.java:4044) at java.awt.Container.addNotify(Container.java:1572) at javax.swing.JComponent.addNotify(JComponent.java:3500) at java.awt.Container.addNotify(Container.java:1579) at javax.swing.JComponent.addNotify(JComponent.java:3500) at java.awt.Container.addNotify(Container.java:1579) at javax.swing.JComponent.addNotify(JComponent.java:3500) at java.awt.Container.addNotify(Container.java:1579) at java.awt.Container.addNotify(Container.java:1579) at javax.swing.JComponent.addNotify(JComponent.java:3500) at java.awt.Container.addNotify(Container.java:1579) at java.awt.Container.addNotify(Container.java:1579) at javax.swing.JComponent.addNotify(JComponent.java:3500) at java.awt.Container.addNotify(Container.java:1579) at javax.swing.JComponent.addNotify(JComponent.java:3500) at java.awt.Container.addNotify(Container.java:1579) at javax.swing.JComponent.addNotify(JComponent.java:3500) at java.awt.Container.addNotify(Container.java:1579) at javax.swing.JComponent.addNotify(JComponent.java:3500) at javax.swing.JRootPane.addNotify(JRootPane.java:483) at java.awt.Container.addNotify(Container.java:1579) at javax.swing.JComponent.addNotify(JComponent.java:3500) at java.awt.Container.addNotify(Container.java:1579) at javax.swing.JComponent.addNotify(JComponent.java:3500) at javax.swing.JInternalFrame.show(JInternalFrame.java:1459) at java.awt.Component.show(Component.java:946) at java.awt.Component.setVisible(Component.java:903) at javax.swing.JComponent.setVisible(JComponent.java:1833) at MOFASmockup.<init>(MOFASmockup.java:60) at MOFASmockup.main(MOFASmockup.java:415)
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