ruby on rails - Active admin - checkbox doesn't make batch action enabled -

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i install 

gem 'activeadmin',         github: 'gregbell/active_admin', branch: 'rails4'

and works fine but.. when click on checkbox resources, batch action doesn't change enabled. have:

  index |description|    selectable_column    column :id    column :user    column :description    default_actions   end    batch_action :destroy, :confirm => "delete ??", :plural_model => "descriptions" |selection| profile.find(selection).each { |d| d.reset_description! } redirect_to collection_path   end

and batch action :destroy. active admin works correct in rails 4?

had same problem, first comment of op solved me: add 

//= require active_admin/base

to 

active_admin.js

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