AIJ  backup  not  possible  when  modified  journals  have  been
  overwritten

  Explanation:  An attempt was  made  to  perform  an  after-image
  backup  when  one  or  more of the active AIJ journals have been
  overwritten.   Backing  up  an  AIJ  journal   that   has   been
  overwritten  is not possible, because AIJ data was lost when the
  journal was overwritten, making  the  database  non-recoverable.
  The  resulting  AIJ backup file could not be used for subsequent
  AIJ roll-forward operations.

  User Action:  Perform a full database  backup.   Once  the  full
  database  backup  has been completed, after-image journal backup
  operations will again be possible.