/sys$common/syshlp/helplib.hlb CC, Messages, NEEDINTEXPR  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        <Context> "<expression>" has <type> type, which is
                not integral.

 Description    An expression that must be an integer type was not
                integral.  For example, an array-index specifier must
                be an integral type.

 User Action    Modify the expression so that it is an integral type.