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

 Message        Parameter substitution produced an invalid string
                literal.

 Description    In certain modes, the compiler will replace
                identifiers found within a string literal if they
                match a macro argument name.  This form of "old-style
                stringization" is provided for compatibility with
                older C compilers.  This message is output if this
                replacement forms an invalid string literal.

 User Action    Modify the macro argument so that a valid string is
                formed.  Compaq also recommends that the macro body
                be rewritten to use the standard C stringize operator
                (#).