VMS Help CC, Messages, DESIGBADIND1  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        <Context> , the array element designator
                "[<expression>]" specifies an element beyond the end
                of the array.

 Description    An array element designator must specify a valid
                array element.

 User Action    Correct the element designator.