help with error in init.el

[Alicia López Jáuregui]

I´m trying to install ESS + XEmacs with R, following the instructions of 
John Foxmin its .pdf document "An introduction to ESS+XEmacs. for 
WIndows Users of R"
When I launch XEmacs software the error message is:
"An error has occurred while loading c:\Documents and 
Settings\Administrador\.xemacs\init.el:

Symbol's function definition is void: ad-add-advice

To ensure normal operation, you should investigate the cause of the error
in your initialization file and remove it.  Use the `-debug-init' option
to XEmacs to view a complete error backtrace."

Any suggestion will be welcomed,
Regrets,