private method `total_price' called for #<LineItem:

Question

I'm working with Depot tutorial, I'm having an issue when defining total price: this is the error I'm getting: does anyone knows what is wrong with it? thank you.

NoMethodError in Carts#show

Showing C:/pan/app/views/carts/show.html.erb where line #7 raised:

private method `total_price' called for #<LineItem:0x3ed2640>
Extracted source (around line #7):

4: <tr>
5: <td><%= item.quantity %>&times;</td>
6: <td><%= item.product.brand %></td>
7: <td class="item_price" ><%= number_to_currency(item.total_price) %></td>
8: </tr>
9: <% end %>
10: <tr class="total_line" >