Oracle Message ORA-15554 - cannot start workload replay client because the database server is not in PREPARE mode

ERRORcannot start workload replay client because the database server is not in PREPARE mode
CAUSEThe Workload Replay Client could not connect to the database server because the database server was not in the PREPARE mode.
ACTIONPut the database in PREPARE mode by using DBMS_WORKLOAD_REPLAY.PREPARE_REPLAY, and restart the Workload Replay Client.