Capistrano 2: Capistranos shared/image folder is empty after running cap deploy

I am on capistrano version 2.I have store users images in rails public/image folder,but on remote server i want to put images store inside public/image folder into shared/image folder.

My code for capistrano's deploy.rb file is as below.

set :shared_children, shared_children +  %w{public/images}

after 'deploy:update_code', 'deploy:symlink_uploads'
namespace :deploy do
  task :symlink_uploads do

    run "ln -nfs /home/ubuntu/shared/image /home/ubuntu/current/public/image"

  end
end

With the above code when i run cap deploy the symlink and code get updated successfully but my shared/images folder doesn't contain any image. I check my svn repo and images are present in public/image folder then why those images are not coming in shared/image folder after running cap deploy command.

Please help

Thanks,