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

 Message        Bad argument for "defined" operator.

 Description    The defined preprocessing operator was given an
                invalid argument.  The operator expects an identifier
                optionally enclosed in parenthesis.  The value of the
                operator is undefined.

 User Action    Supply a valid argument to the preprocessing
                operator.