error with "defadvice"

[Liaw, Andy]

Dear ESS-help,

I'm getting an error at XEmacs startup when ess-site.el is loaded.  First,
the system:
WinNT4, XEmacs 21.4.6, ess-5.1.21

When XEmacs starts, it complains that 
Symbol's function definition is void: defadvice

I found "defadvice" in ess.el.  Does anyone know how to resolve this?

TIA,
Andy


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