The specified number of output parameters exceeds the number  of
  storage areas.

  Explanation:  The number of output parameters specified  exceeds
  the  number  of  storage  areas in the database to be backed up.
  This would cause backup files to be written  that  contained  no
  data.

  User Action:  Re-enter the backup command specifying a number of
  output  parameters  which  does not exceed the number of storage
  areas to be backed up.