the auxiliary database must be not mounted when issuing a DUPLICATE command
CauseA DUPLICATE command was issued, but the auxiliary database is mounted.
ActionDismount the auxiliary database.
The Google Search results shown above are obtained by searching for this error using a custom google search engine which is restricted to a specific list of oracle reference sites. If you know a good oracle reference/help site and think that site should be included in this search, you can contribute to this search engine here.