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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.(MOFASmockup.java:60)	at MOFASmockup.main(MOFASmockup.java:415)