Oracle Message AUD-00808 - ORDSpeechIndex: unable to CREATE internal Text index

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ERRORORDSpeechIndex: unable to CREATE internal Text index
CAUSECREATE INDEX for ORDSpeechIndex failed when trying to create internal Text index.
ACTIONMake sure that you are supplying a valid parameter string. See SpeechIndexing and Oracle Text documentation for descriptions of a valid parameter string for CREATE INDEX. To return to a consistent state, issue a DROP INDEX command.