ORA-16820: fast-start failover observer is no longer observing this database

admin

ORA-16820: fast-startfailover observer is no longer observing this database
Cause: A previously started observer was no longer activelyobserving this
database. A significant amount of time elapsed since this database last heardfrom
the observer. Possible reasons were:
- The host where the observer was running was not available.
- The network connection between the observer and this database was not
available.
- The observer process was terminated unexpectedly.
Action: Checkthe reason why the observer cannot contact this database. If the
problem cannot be corrected, stop the current observer by connecting to theData
Guard configuration and issue the DGMGRL STOP OBSERVER command. Then,
restart the observer on another host. Finally, use the DGMGRL START OBSERVER
command to start the observer on the other host.