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

 Message        Token pasting operator missing both operands.

 Description    The preprocessing token pasting operator "##" appears
                in a macro body without either the preceeding or
                following token arguments.

 User Action    Either remove the operator or supply it with two
                tokens that will be pasted together.