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

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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)

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