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

  ERROR:  At the point marked in the specification, one type of object
  (such  as  a  widget)  is required and your specification supplied a
  different type of object (such as value).

  USER ACTION:  Check for misspelling or that you have referred to the
  intended object.