"undefined method 'trips_path for..." can anyone help?

Hi,

I'm trying to use recipe 20 (handle multiple models in one form from
"advanced rails recipes" but I'm hitting the error in the topic..

I basically try to access /trips/new (it's supposed to be an e-
commerce solution for a tour operator) but new.html.erb raises:

### ERROR ###
NoMethodError in Trips#new

Showing trips/new.html.erb where line #2 raised:

undefined method `trips_path' for #<ActionView::Base:0x178f504>
Extracted source (around line #2):

1: <%= error_messages_for :trip %>
2: <% form_for(@trip) do |f| %>
3: <p>name <%= f.text_field :name %></p>
4: <div id="departures">
5: <% render :partial => 'departure', :collection =>
@trip.departures %>
### END OF ERROR ###

What could cause the "trips_path" undefined method? I'm guessing I
forgot something in the controller? I have tried form_for @trip as the
book was suggesting but the error is still there, so I'm guessing
that's not the problem

So far I've been able to find solutions to my errors simply by
googling for the error, but it's not helpfull enough this time :\

Do you need me to paste some of the controllers or templates?

Nevermind, solved.