The <str> <str> <str> storage area(s) must also be specified for
  the restore.

  Explanation:  This error can occur during an incremental by-area
  restore  operation when the RDB$SYSTEM and/or the default and/or
  the list segment storage areas are not included in the  list  of
  storage  areas  to  be  restored.   If  incremental changes have
  occured to any of these three storage areas and these areas  are
  not  restored  then  tables  in  the  database affected by these
  changes will appear to be corrupted.

  User  Action:   Rerun  the  restore  operation   including   the
  requested storage areas in the list of storage areas to restore.