The ASM rebalance coordinator process died.
Warm start instance.
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Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e0.htm
https://community.oracle.com/message/3206034
https://community.oracle.com/message/2699765
https://community.oracle.com/message/3206015
https://community.oracle.com/message/2706622