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

 Message        <Context> "<name>" is not declared.

 Description    An identifier used in an expression has not been
                declared.  The only time an identifier can be used
                and not previously declared is when the identifier
                specifies the function name in a function call.

 User Action    Either declare the identifier or remove its use.