ruby on rails - active admin image field is shown dirty -

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i using activeadmin gem admin console in ror application. in activeadmin model-featuredevent have declared form creating featured event. featuredevent model image field tried writing it. says nomethoderror in admin::featuredevents#new undefined method `new' nil:nilclass. following activeadmin model:

activeadmin.register featuredevent permit_params permitted = [:name, :location, :start_time, :description,:image,:phone, :email, :event_url, :active, :free, :image, :s3_credentials] permitted << :other if params[:action] == 'create' permitted end  controller def create      byebug     @featuredevent = event.new(permitted_params[:featuredevent])      if @featuredevent.save         redirect_to '/admin/featured_events#index'     else         flash[:message] = 'error in creating image.'     end   end  def event_params     params.require(:event).permit(:name, :location, :start_time, :description,:image,:phone, :email, :event_url, :active, :free, :image, :s3_credentials) end end  form |f| inputs 'create private events'    input :image end  actions     button_to  'create', featured_speakers_path(:featuredevent), method: :post             #link_to 'create', {:controller => 'events', :action => 'create'}, {:method => :post } end  end  end

error in browser on navigating create featured event: 

**nomethoderror in admin::featuredevents#new** undefined method `dirty?' nil:nilclass

ok got it. paperclip needs different name attachment declaration in featuredevent model [i have other model in image used ]. thank vishal


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