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

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java.lang.NullPointerException:
at java.util.Hashtable.put(Unknown Source)
at oracle.apps.ad.clone.util.CloneCleanser.doMigrate(CloneCleanser.java:98)
at oracle.apps.ad.context.CloneContext.doClone(CloneContext.java:710)
at oracle.apps.ad.context.CloneContext.main(CloneContext.java:5093)

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