Error: ORA-16647: could not start more than one observer

Although observer is not started receiving the following error while starting the observer

[W000 01/03 12:44:30.72] Failed to start the Observer.
Error: ORA-16647: could not start more than one observer

DGMGRL> show configuration verbose;
..................................................................

..................................................................

Fast-Start Failover: DISABLED
Threshold:          300 seconds
Target:             ORCL1S
Observer:           host_observer
Lag Limit:          30 seconds (not in use)
Shutdown Primary:   TRUE
Auto-reinstate:     TRUE
Observer Reconnect: (none)
Observer Override: FALSE
Configuration Status:
SUCCESS
show configuration verbose still showing observer hostname.

Solution:
Stop the observer from dgmgrl utility and then try to start it again

dgmgrl /
DGMGRL for Linux: Version 12.1.0.2.0 - 64bit Production

Copyright (c) 2000, 2013, Oracle. All rights reserved.
Welcome to DGMGRL, type "help" for information.
Connected as SYSDG.
DGMGRL> stop observer;
Done.
DGMGRL> start observer;

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