Answer / guest

Cause: A select was issued from v$logmnr_contents without
first invoking the dbms_logmnr.start_logmnr() procedure.
Otherwise, dbms_logmnr.end_logmnr() was called without a
prior call to dbms_logmnr.start_logmnr() or
dbms_logmnr.add_logfile()

Action: Invoke the dbms_logmnr.start_logmnr() procedure
before issuing a select from the v$logmnr_contents view.

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