Mau tanya tentang paginate

saya punya code nih yang error

undefined method `paginate' for #<ArticlesController:0x47052ac>

app/controllers/articles_controller.rb:5:in `index'

dan ini code nya

def index
	if params[:category_id]
		@articles_pages, @articles = paginate(:articles,:include => :user,:order => 'published_at
DESC',:conditions => "category_id=#{params[:category_id].to_i} AND published=true")
	else
		@articles = Article.find_all_by_published(true)
		@articles_pages, @articles = paginate(:articles,:include => :user,:order => 'published_at
DESC',:conditions => "published = true")
	end
		respond_to do |wants|
		wants.html
		wants.xml { render :xml => @articles.to_xml }
		wants.rss { render :action => 'rss.rxml', :layout => false }
		wants.atom { render :action => 'atom.rxml', :layout => false }
	end
end

undefined method `paginate' for #<TopicsController:0x46fcfbc>

app/controllers/topics_controller.rb:6:in `index'

def index
@forum = Forum.find(params[:forum_id])
@topics_pages, @topics = paginate(:topics,:include => :user,:conditions => ['forum_id = ?',
@forum],:order => 'topics.updated_at DESC')
respond_to do |format|
format.html # index.rhtml
format.xml { render :xml => @topics.to_xml }
end
end

udah mentog banget nih, kawan2 yang bisa bantu saya minta tolong kasih tau errornya sebelah mana atau saya
harus tambah will_paginate plugin???

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