ruby on rails - NoMethodError (undefined method `authenticate_admin_user!' for #<Admin::DashboardController -

we using ruby 2.1 rails 3.2 , active admin 0.6.3. our site , running on front end when trying access admin panel, says:

"nomethoderror (undefined method `authenticate_admin_user!' admin::dashboardcontroller"  

i've tried searching on net solutions none of them worked out.!

any suggestions?

edit : admin user model

activeadmin.register adminuser        #menu :priority => 2   menu false      index :title => 'admin users'+sitesetting.site_title                               column :email      column :role |show|       if show.role=="superadmin"           status_tag('super admin', :ok)       elsif show.role=="subadmin"           status_tag('sub admin', :ok)       elsif show.role=="customeadmin"           status_tag('custom admin', :ok)       else           status_tag('normal admin', :ok)       end     end                           column 'current login', :current_sign_in_at             column 'last login', :last_sign_in_at                column 'login count', :sign_in_count                  #current_admin_user[:id]     @count = adminuser.count    if @count == 1       column |show|         links = link_to 'view', {:action => show.id.to_s}         links += ' '         links += link_to 'edit', {:action => show.id.to_s+'/edit'}         links       end      else      default_actions    end      end                                     controller     def password       render :text => 'test'     end       def new            @admin_user = adminuser.new      end                  def create            @temp = params[:admin_user][:role_permission]           if @temp ==nil            else             @new_per = @temp.join(',')              params[:admin_user][:role_permission] = @new_per            end           @admin_user = adminuser.new(params[:admin_user])          @admin_user.save          redirect_to(:action => 'index')        end         def edit         @admin_user = adminuser.find(params[:id])       end           end    filter :email                           sidebar :adminuserrights       ul         li "super admin: can manage pages"         li "sub admin: can view , update pages"         li "normal admin: can view pages"         li "custom admin: customize admin via giving them custom rights of links"       end     end       form :html => { :enctype => "multipart/form-data" } |f|             render "create" , :layout => 'active_admin'         end    end                     

i 've code added in application controller file.

edit : application controller

 def authenticate_active_admin_user!         authenticate_admin_user!         unless current_admin_user.role?(:superadmin)             flash[:alert] = "you not authorized access resource!"             redirect_to root_path         end   end