VMS Help UIL, Compile Time Errors, CIRCULAR_DEF  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  ERROR:  The indicated  object  is  referenced  as  a  descendant  of
  itself, either within its own definition or within the definition of
  one of the objects in the widget hierarchy which it controls.

  USER ACTION:  Change the definition of the indicated object so  that
  it is not a descendant of itself.