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

 Message        <Context> "<expression>" is of type "<type>", and
                cannot be converted to a different "<type>" type.

 Description    A struct or union of one type cannot be converted to
                a different struct or union type.

 User Action    Modify the conversion to use valid types.