[258] ORA-01418: specified index does not exist
[258] AbortScriptWithError()
[258] AbortScript: Aborted ORA-01418: specified index does not exist
(os errno 13)
Indexes were being reorganized separately at the same time the table was being reorganized
One script was executed to recreate the tables. As part of recreating the table, the index was dropped. For example, the time 02/10 16:02:09 line=61 sql=DROP INDEX <INDEX NAME>
The index was recreated at 02/10 17:15:23 line=5381 sql=Create UNIQUE Index <USER>.<INDEX NAME>
In the meantime, another script, containing the alter index rebuild was executing.
Note the timestamp:
[258] 02/10 17:00:07 line=11 sql=ALTER INDEX <USER>.<INDEX NAME> REBUILD
A the time the second script attempted the rebuild - the index did not exist, as its parent table was being recreated. This might also explain the resource busy which can exist in the script execution log.