Oracle Error Message
RMAN-06818: WARNING: last archived log from primary database not recieved at standby database
Reason for the Error
An archived log was switched at the primary database during backup at the standby database and this log was not shipped to the standby database. The backup created at the standby database will need more logs to recover.
Solution
Check whether the standby databse is configured correctly to recieve logs from the primary database.