Cause
The Observer configuration file cannot be opened or cannot be locked for exclusive access.
The Observer configuration file cannot be opened or cannot be locked for exclusive access.
Make sure the Observer has the correct operating system privileges to write the file and there is no other Observer that is using the same file. Try the command again.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/dgmus.htm
http://docs.oracle.com/cd/E16655_01/server.121/e17641/troubleshooting.htm
http://docs.oracle.com/cd/E16655_01/server.121/e17641/dgmgrl.htm
https://community.oracle.com/message/10169150
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