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

 Message        <Context> this argument to <function name> is of
                "<type name>" type and is not appropriate for the
                conversion specifier "<incorrect conversion>".  The
                value will be formatted in an unintended manner.

 Description    The compiler has detected a string conversion
                specifier that does not match its corresponding
                argument.  This might not have been what you
                intended.

 User Action    Modify either the argument or the conversion
                specifier so that they match.