Oracle Message NNC-00422 - invalid data type name string

ERRORinvalid data type name string
CAUSEA caller has provided an invalid data type name to the name server program interface.
ACTIONNot 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 valid type name. Otherwise, turn on tracing and re-execute the failing operation. If the error persists, contact Worldwide Customer Support.