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NNC-00417:

name "string" already exists
Cause: A caller has attempted to create a new global name, and that name already exists.
Action: Not normally visible to the user, except when using the name server control program. If the error occurs when using the control program, retry the failing operation with a name that does not already exist. Otherwise, turn on tracing and re-execute the failing operation. If the error persists, contact Worldwide Customer Support.