The cluster could not be set to rolling upgrade mode because Oracle Clusterware was not active on any of the remote nodes.
Start Oracle Clusterware on at least one remote node and retry the 'crsctl start rollingupgrade' command, or retry upgrade using the non-rolling option.
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Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/crsus.htm