A configuration change that involved the addition of voting files is being rejected because some of the new voting files were not located.
Verify that the voting file name is correct and that it is accessible on this node, if the voting files are not managed by ASM. Message number 1638 provides greater detail.
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Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/crsus.htm