Rails - Sep 2012 - Depot, private issue

I got the following error.
My guess is that there is a ''private'' setting in the lineitem
class, but
I can''t find it :-(

"NoMethodError in Carts#show

Showing
/Users/kwadwoadu/src/ruby-test/depot/app/views/carts/show.html.erb where
line #11 raised:

private method `total_price'' called for
#<LineItem:0x007f98e108a0a8>
Extracted source (around line #11):

8:   <tr>
9:     <td><%= item.quantity %>&times;</td>
10:     <td><%= item.product.title %></td>
11:     <td class="item_price"><%=
number_to_currency(item.total_price)
%></td>
12:   </tr>
13: <% end %>
14: <tr class="total_line">"

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