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java.lang.NullPointerException: 	at javax.swing.text.rtf.RTFReader$StylesheetDestination$StyleDefiningDestination.close(RTFReader.java:914)	at javax.swing.text.rtf.RTFReader.setRTFDestination(RTFReader.java:247)	at javax.swing.text.rtf.RTFReader.handleKeyword(RTFReader.java:477)	at javax.swing.text.rtf.RTFParser.write(RTFParser.java:232)	at javax.swing.text.rtf.AbstractFilter.readFromReader(AbstractFilter.java:105)	at javax.swing.text.rtf.RTFEditorKit.read(RTFEditorKit.java:111)	at javax.swing.plaf.basic.BasicTextUI$TextTransferHandler.handleReaderImport(BasicTextUI.java:2143)	at javax.swing.plaf.basic.BasicTextUI$TextTransferHandler.importData(BasicTextUI.java:2314)	at javax.swing.TransferHandler$TransferAction.actionPerformed(TransferHandler.java:820)	at javax.swing.text.JTextComponent.invokeAction(JTextComponent.java:1203)	at javax.swing.text.JTextComponent.paste(JTextComponent.java:1181)	at edu.iyte.wp.actions.PasteAction.actionPerformed(PasteAction.java:60)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)	at javax.swing.AbstractButton.doClick(AbstractButton.java:289)	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1113)	at javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseReleased(BasicMenuItemUI.java:943)	at java.awt.Component.processMouseEvent(Component.java:5100)	at java.awt.Component.processEvent(Component.java:4897)	at java.awt.Container.processEvent(Container.java:1569)	at java.awt.Component.dispatchEventImpl(Component.java:3615)	at java.awt.Container.dispatchEventImpl(Container.java:1627)	at java.awt.Component.dispatchEvent(Component.java:3477)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)	at java.awt.Container.dispatchEventImpl(Container.java:1613)	at java.awt.Window.dispatchEventImpl(Window.java:1606)	at java.awt.Component.dispatchEvent(Component.java:3477)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)