| ERROR | LOG_ARCHIVE_DEST cannot be NULL because LOG_ARCHIVE_DUPLEX_DEST is non-NULL |
| CAUSE | An attempt was made to change parameter LOG_ARCHIVE_DEST to NULL when parameter LOG_ARCHIVE_DUPLEX_DEST is non-NULL. |
| ACTION | Either set parameter LOG_ARCHIVE_DEST to a non-NULL value, or set parameter LOG_ARCHIVE_DUPLEX_DEST to a NULL value. |