Rendering D：/new/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/templates/rescues/layout.erb(not_found)

I am using Instant rails to establish a website on which there is basic information开发者_如何学JAVA about commodities. To achieve that,I typed the following cmds.

rails mebay
cd mebay
ruby script/generate model ad name:string description:text price:decimal seller_id:integer email:string img_url:string
rake db:migrate
ruby script/generate controller ads

then I create a file show.html.erb,later I add the code

map.connect '/ads/:id', :controller=>'ads', :action=>'show'

in the config/route.rb then I start the server,but it turns out "unknown action to show" on the webpage. And in the command appears the words in the title

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ok this comments discussion is much longer than i anticipated

what you pasted into title of this question is only small part of error that rails shows you in console where you started rails application

i don't know how to put it more clearly - copy paste full error dump from either console where you started rails application or from your /log/development.log file. you did copy "/new/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/templates/rescues/layout.erb(not_found)" from somewhere didn't you?