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

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java.lang.NullPointerException:
at java.util.Hashtable.put(Hashtable.java:393)
at javax.swing.JEditorPane.registerEditorKitForContentType(JEditorPane.java:1135)
at javax.swing.JEditorPane.registerEditorKitForContentType(JEditorPane.java:1117)
at javax.swing.JEditorPane.loadDefaultKitsIfNecessary(JEditorPane.java:1182)
at javax.swing.JEditorPane.getKitTypeRegistry(JEditorPane.java:1152)
at javax.swing.JEditorPane.createEditorKitForContentType(JEditorPane.java:1077)
at javax.swing.JEditorPane.getEditorKitForContentType(JEditorPane.java:975)
at javax.swing.JEditorPane.setContentType(JEditorPane.java:869)
at com.piper.trilogiview.ui.warningcaution.Popup.(Popup.java:73)

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