cannot backup current AIJ journal if no other unmodified
  journals exist

  Explanation:  An attempt was made to backup the "current"
  after-image journal, but no other unmodified after-image
  journals are available.  This situation occurs when a
  "by-sequence" backup is performed in the wrong order; that is,
  the current after-image journal was backed up when a "modified"
  lower sequence after-image journal exists.

  User Action:  Backup the lower-sequence after-image journal
  first.