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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