cannot find an AIJ journal with sequence number <num>

  Explanation:   A  "by-sequence"   after-image   journal   backup
  operation  was  attempted  with  a  sequence number that did not
  currently exist for any known AIJ journal.

  User Action:  Specify a valid AIJ sequence number, or perform  a
  full  AIJ  backup  by  not  specifying the "by-sequence" command
  qualifier.