function definition void

[Baloff]

Hello
while reading the manual

I copied and yanked this in my ./gnus.el file but it is giving article
function definition void: or something like that in the minibuffer
when I load-file ./gnus.el

(article (horizontal 1.0
                     (vertical 0.5
                               (group 1.0)
                               (gnus-carpal 4))
                     (vertical 1.0
                               (summary 0.25 point)
                               (summary-carpal 4)
                               (article 1.0))))
I got it from
http://www.gnus.org/manual/gnus_272.html#SEC272
what am I doing wrong?

thanks