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java.lang.NullPointerException: 	at java.util.Hashtable.put(Unknown Source)	at javax.swing.JEditorPane.registerEditorKitForContentType(Unknown Source)	at javax.swing.JEditorPane.registerEditorKitForContentType(Unknown Source)	at javax.swing.JEditorPane.loadDefaultKitsIfNecessary(Unknown Source)	at javax.swing.JEditorPane.getKitTypeRegistry(Unknown Source)	at javax.swing.JEditorPane.getEditorKitClassNameForContentType(Unknown Source)	at javax.swing.JTextPane.(Unknown Source)