Error : ORA-10459 "cannot start media recovery on standby database; conflicting state detected"

Error : ORA-10459 "cannot start media recovery on standby database; conflicting state detected"
Cause :
An attempt To Start Up The MRP Process In Physical Standby fails with error ORA-10459 "cannot start media recovery on standby database; conflicting state detected"

Solution :
Managed recovery can be run only from One instance of Rac Standby.
To check if Managed recovery is already running on a specific instance you can run the below query
Select * from gv$managed_standby ;
Or
Check the alert log.
If Managed recovery is already running on a instance and you want it to be run from specific instance:
Stop the Managed recovery from the instance it is running and start managed recovery from first/specific instance.