Oracle Message AUD-00809 - ORDSpeechIndex: unable to ALTER REBUILD internal Text index

ERRORORDSpeechIndex: unable to ALTER REBUILD internal Text index
CAUSEALTER INDEX REBUILD for ORDSpeechIndex failed when trying to alter rebuild 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 ALTER INDEX REBUILD. To return to a consistent state, issue a ALTER INDEX REBUILD PARAMETERS(optimize full) command.