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

 Message        An invalid multibyte character was encountered in a
                comment.

 Description    An invalid multibyte character was found in a
                comment.  While this will not affect the program
                execution, it might not have been what you intended.

 User Action    Correct the multibyte character.