Weird Routing Issue - No Method Error - ruby-on-rails

Question

I'm getting a no method error when loading form for a nested resource. I have a fix for it but it's not right I'm sure.
My routes.rb contains:
resources :orders do
resources :comments, :technicals, :milestones
end
At the top of my techncials.html.erb form I have this:
<%= semantic_form_for([#order, #technical]) do |f| %>
When loading the form, I get an error:
> NoMethodError in Technicals#new
>
> undefined method `technicals_path' for
> #<#<Class:0x00000102118318>:0x000001020ec470>
If I then put this in my routes, it all works just fine:
resources :technicals, :only => [ :create ]
What on earth am I doing wrong, if anything??!
Edit: I think My models etc. are all set up correctly:
class Technical < ActiveRecord::Base
belongs_to :order
end
-- edit --
company_order_comments GET /companies/:company_id/orders/:order_id/comments(.:format) {:action=>"index", :controller=>"comments"}
POST /companies/:company_id/orders/:order_id/comments(.:format) {:action=>"create", :controller=>"comments"}
new_company_order_comment GET /companies/:company_id/orders/:order_id/comments/new(.:format) {:action=>"new", :controller=>"comments"}
edit_company_order_comment GET /companies/:company_id/orders/:order_id/comments/:id/edit(.:format) {:action=>"edit", :controller=>"comments"}
company_order_comment GET /companies/:company_id/orders/:order_id/comments/:id(.:format) {:action=>"show", :controller=>"comments"}
PUT /companies/:company_id/orders/:order_id/comments/:id(.:format) {:action=>"update", :controller=>"comments"}
DELETE /companies/:company_id/orders/:order_id/comments/:id(.:format) {:action=>"destroy", :controller=>"comments"}
company_orders GET /companies/:company_id/orders(.:format) {:action=>"index", :controller=>"orders"}
POST /companies/:company_id/orders(.:format) {:action=>"create", :controller=>"orders"}
new_company_order GET /companies/:company_id/orders/new(.:format) {:action=>"new", :controller=>"orders"}
edit_company_order GET /companies/:company_id/orders/:id/edit(.:format) {:action=>"edit", :controller=>"orders"}
company_order GET /companies/:company_id/orders/:id(.:format) {:action=>"show", :controller=>"orders"}
PUT /companies/:company_id/orders/:id(.:format) {:action=>"update", :controller=>"orders"}
DELETE /companies/:company_id/orders/:id(.:format) {:action=>"destroy", :controller=>"orders"}
companies GET /companies(.:format) {:action=>"index", :controller=>"companies"}
POST /companies(.:format) {:action=>"create", :controller=>"companies"}
new_company GET /companies/new(.:format) {:action=>"new", :controller=>"companies"}
edit_company GET /companies/:id/edit(.:format) {:action=>"edit", :controller=>"companies"}
company GET /companies/:id(.:format) {:action=>"show", :controller=>"companies"}
PUT /companies/:id(.:format) {:action=>"update", :controller=>"companies"}
DELETE /companies/:id(.:format) {:action=>"destroy", :controller=>"companies"}
order_comments GET /orders/:order_id/comments(.:format) {:action=>"index", :controller=>"comments"}
POST /orders/:order_id/comments(.:format) {:action=>"create", :controller=>"comments"}
new_order_comment GET /orders/:order_id/comments/new(.:format) {:action=>"new", :controller=>"comments"}
edit_order_comment GET /orders/:order_id/comments/:id/edit(.:format) {:action=>"edit", :controller=>"comments"}
order_comment GET /orders/:order_id/comments/:id(.:format) {:action=>"show", :controller=>"comments"}
PUT /orders/:order_id/comments/:id(.:format) {:action=>"update", :controller=>"comments"}
DELETE /orders/:order_id/comments/:id(.:format) {:action=>"destroy", :controller=>"comments"}
order_technicals GET /orders/:order_id/technicals(.:format) {:action=>"index", :controller=>"technicals"}
POST /orders/:order_id/technicals(.:format) {:action=>"create", :controller=>"technicals"}
new_order_technical GET /orders/:order_id/technicals/new(.:format) {:action=>"new", :controller=>"technicals"}
edit_order_technical GET /orders/:order_id/technicals/:id/edit(.:format) {:action=>"edit", :controller=>"technicals"}
order_technical GET /orders/:order_id/technicals/:id(.:format) {:action=>"show", :controller=>"technicals"}
PUT /orders/:order_id/technicals/:id(.:format) {:action=>"update", :controller=>"technicals"}
DELETE /orders/:order_id/technicals/:id(.:format) {:action=>"destroy", :controller=>"technicals"}
order_milestones GET /orders/:order_id/milestones(.:format) {:action=>"index", :controller=>"milestones"}
POST /orders/:order_id/milestones(.:format) {:action=>"create", :controller=>"milestones"}
new_order_milestone GET /orders/:order_id/milestones/new(.:format) {:action=>"new", :controller=>"milestones"}
edit_order_milestone GET /orders/:order_id/milestones/:id/edit(.:format) {:action=>"edit", :controller=>"milestones"}
order_milestone GET /orders/:order_id/milestones/:id(.:format) {:action=>"show", :controller=>"milestones"}
PUT /orders/:order_id/milestones/:id(.:format) {:action=>"update", :controller=>"milestones"}
DELETE /orders/:order_id/milestones/:id(.:format) {:action=>"destroy", :controller=>"milestones"}
orders GET /orders(.:format) {:action=>"index", :controller=>"orders"}
POST /orders(.:format) {:action=>"create", :controller=>"orders"}
new_order GET /orders/new(.:format) {:action=>"new", :controller=>"orders"}
edit_order GET /orders/:id/edit(.:format) {:action=>"edit", :controller=>"orders"}
order GET /orders/:id(.:format) {:action=>"show", :controller=>"orders"}
PUT /orders/:id(.:format) {:action=>"update", :controller=>"orders"}
DELETE /orders/:id(.:format) {:action=>"destroy", :controller=>"orders"}
/orders(.:format) {:controller=>"orders", :action=>"index"}
root /(.:format) {:controller=>"home", :action=>"index"}

Answer 1

NoMethodError in Technicals#new
Does controllers/technicals_controller.rb have a "def new"?
If not, try adding one:
def new
#technical = Technical.new
end