Routing error for GET] "/firstapp"

I was trying to write my first program after installation, but I got an error like below:

Routing Error
No route matches [GET] "/firstapp"

I've tried to change my config/routes.rb file but nothing changed. This is my config/routes.rb

Firstapp::Application.routes.draw do
  resources :apptables

  # The priority is based upon order of creation:
  # first created -> highest priority.

  # con开发者_如何学Gotinues with default `config/routes.rb` explanations...
end    

How can I configure the config/routes.rb to make it run properly?

Just saying resources :apptables sets up the standard seven routes:

GET    /apptables
GET    /apptables/new
POST   /apptables
GET    /apptables/:id
GET    /apptables/:id/edit
PUT    /apptables/:id
DELETE /apptables/:id

There is no /firstapp in that list so that route won't work. If you want a GET on /firstapp to work then you can set up that route manually:

match '/firstapp' => 'firstapp#some_method', :via => :get

That would route GET /firstapp to FirstappController#some_method.