| ERROR | BACKUP_TAPE_IO_SLAVES not enabled when duplexing to sequential devices |
| CAUSE | An attempt was made to specify duplexing to sequential devices, but the BACKUP_TAPE_IO_SLAVES initialization parameter was not enabled. |
| ACTION | Specify BACKUP_TAPE_IO_SLAVES=TRUE in the INIT.ORA file, or do not specify duplexing to sequential devices. |