/sys$common/syshlp/helplib.hlb CC, Messages, INVALIDSTR  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        The # operator produced an invalid string.

 Description    During the expansion of a macro, the # stringize
                operator produced a token that is not a valid string.
                The operand to the stringize operator must contain
                characters that form a valid string.

 User Action    Correct the operand to the stringize operator.