VMS Help CC, Messages, NEEDMEMBER  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        <Context> "<name>" is not a member of "<struct or
                union expression>".

 Description    The second operand of a .  or -> operator specifies a
                member name that is not a member of the struct or
                union type specified by the first operand.  Note that
                in certain modes, Compaq C will search all other
                visible struct/union types for a matching member
                name.  If it finds one, a diagnostic will be issued,
                and the offset of that name will be used.

 User Action    Specify a valid member name.