Routes.rb - from Rails 2.x to Rails 3.x “How to Create a Blog from Scratch Using Ruby on Rails” tutorial

I'am working on "How to Create a Blog from Scratch Using Ruby on Rails" from The tutorial was created for Rails 2.x. I try to get It working on Rails 3.x. . When I run server I and run localhost:3000 get some serious routing error:

Called from: C:/Ruby193/lib/ruby/gems/1.9.1/gems/actionpack-3.2.6/lib/ac
tion_dispatch/middleware/session/abstract_store.rb:28:in `initialize'.
/mapper.rb:185:in `default_controller_and_action': missing :action (ArgumentError)
from C:/Ruby193/lib/ruby/gems/1.9.1/gem

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