No voting files were discovered. Possible reasons include:
Verify that the filesystems that the voting files are on are active and that the voting files have not been damaged. If necessary, start the clusterware stack in exclusive mode using 'crsctl start crs -excl' and add voting files using 'crsctl add css votedisk'
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Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/crsus.htm