ORA-15504: cannot start workload capture because

admin

ORA-15504: cannotstart workload capture because instance string not present in
RESTRICTED SESSION mode
Cause: The NO_RESTART_MODE option in DBMS_WORKLOAD_
CAPTURE.START_CAPTURE was FALSE, therefore all the active instances were
expected to be in the RESTRICTED SESSION mode.
Action: Startall instances using STARTUP RESTRICT or execute ALTER SYSTEM
ENABLE RESTRICTED SESSION on all active instances before issuing DBMS_
WORKLOAD_CAPTURE.START_CAPTURE.