spree error msg

gistfile1.txt

ActionView::Template::Error (undefined method `to_d' for #<Order:0x82cce98>):
    14:         <h3>Shipping Method:</h3>
    15:         <div class="method">
    16:           <% i = 1 %>
    17:           <% @order.rate_hash.each do |shipping_method| %>
    18:             <%= radio_button(:order, :shipping_method_id, shipping_method[:id], :class => "radio#{i}", :id => shipping_method[:cost]) %>
    19:             <label><%= shipping_method[:name] %> <%= number_to_currency shipping_method[:cost] %></label>
    20:             <div class="clear"></div>
  app/views/checkout/_payment.html.erb:17:in `_app_views_checkout__payment_html_erb___481978343_67756860_4938188'
  app/views/checkout/edit.html.erb:7:in `_app_views_checkout_edit_html_erb__453920959_66761340_0'
  app/views/checkout/edit.html.erb:6:in `_app_views_checkout_edit_html_erb__453920959_66761340_0'