Oracle Message ORA-01306 - dbms_logmnr.start_logmnr() must be invoked before selecting from v$logmnr_contents

ERRORdbms_logmnr.start_logmnr() must be invoked before selecting from v$logmnr_contents
CAUSEA select was issued from v$logmnr_contents without first invoking the dbms_logmnr.start_logmnr() procedure.
ACTIONInvoke the dbms_logmnr.start_logmnr() procedure before issuing a select from the v$logmnr_contents view.