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

 Message        <Context> an array subscript expression is either
                less than zero or greater than the largest value that
                can be represented by the size_t type.

 Description    The compiler has detected an array subscript
                expression that is outside the bounds of any valid
                array.  The array access might cause unpredictable
                behavior.

 User Action    Specify a valid array subscript.