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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:394)	at oracle.cabo.ui.data.DictionaryData.put(Unknown Source)	at oracle.apps.fnd.framework.about.webui.OAAboutPGCO._addDocTable(OAAboutPGCO.java:2668)	at oracle.apps.fnd.framework.about.webui.OAAboutPGCO.processRequest(OAAboutPGCO.java:690)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(OAWebBeanHelper.java:600)