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ORA-01306:

dbms_logmnr.start_logmnr() must be invoked before selecting from v$logmnr_contents
Cause: A select was issued from v$logmnr_contents without first invoking the dbms_logmnr.start_logmnr() procedure.
Action: Invoke the dbms_logmnr.start_logmnr() procedure before issuing a select from the v$logmnr_contents view.