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

 Message        Missing right parenthesis for "defined" operator.

 Description    The defined preprocessing operator began with a left
                parenthesis, but no matching right parenthesis was
                found.  The value of the operator is undefined.

 User Action    Add the right parenthesis after the preprocessing
                operator argument.