DGMGRL could not retrieve the StatusReport property from the given database and thus could not report the database status.
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Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/dgmus.htm
https://community.oracle.com/message/11079548
https://community.oracle.com/message/9666191
https://community.oracle.com/message/11235043
https://community.oracle.com/message/10806972
https://community.oracle.com/message/11054835
https://community.oracle.com/message/10758678
https://community.oracle.com/message/10522040
https://community.oracle.com/message/11280017
https://community.oracle.com/message/10857952
https://community.oracle.com/message/9666524