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java.lang.NullPointerException: 	at javax.swing.text.AbstractWriter.write(AbstractWriter.java:489)	at javax.swing.text.html.HTMLWriter.emptyTag(HTMLWriter.java:315)	at javax.swing.text.html.HTMLWriter.write(HTMLWriter.java:187)	at javax.swing.text.html.HTMLEditorKit.write(HTMLEditorKit.java:289)	at Editor.setAppletAttributes(Editor.java:1017)	at Editor.saveMenuItemActionPerformed(Editor.java:535)	at Editor.access$13(Editor.java:24)	at Editor$14.actionPerformed(Editor.java:421)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1767)	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1820)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:419)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:257)	at javax.swing.AbstractButton.doClick(AbstractButton.java:289)	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1092)	at javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseReleased(BasicMenuItemUI.java:932)	at java.awt.Component.processMouseEvent(Component.java:5021)	at java.awt.Component.processEvent(Component.java:4818)	at java.awt.Container.processEvent(Container.java:1380)	at java.awt.Component.dispatchEventImpl(Component.java:3526)	at java.awt.Container.dispatchEventImpl(Container.java:1437)	at java.awt.Component.dispatchEvent(Component.java:3367)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3214)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2929)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2859)	at java.awt.Container.dispatchEventImpl(Container.java:1423)	at java.awt.Window.dispatchEventImpl(Window.java:1566)	at java.awt.Component.dispatchEvent(Component.java:3367)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:445)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:190)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:144)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:98)