Rails Console Error

Why does this happen? Its a new project and I am new to ruby.
irb(main):018:0> ActionController::Routing::Routes.draw 
NoMethodError: undefined method `arity' for nil:NilClass
	from /opt/local/lib/ruby1.9/gems/1.9.1/gems/activesupport-3.0.4/lib/active_support/whiny_nil.rb:48:in `method_missing'
	from /opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-3.0.4/lib/action_dispatch/routing/route_set.rb:230:in `draw'
	from /opt/local/lib/ruby1.9/gems/1.9.1/gems/activesupport-3.0.4/lib/active_support/deprecation/proxy_wrappers.rb:24:in `method_missing'
	from (irb):18
	from /opt/local/lib/ruby1.9/gems/1.9.1/gems/railties-3.0.4/lib/rails/commands/console.rb:44:in `start'
	from /opt/local/lib/ruby1.9/gems/1.9.1/gems/railties-3.0.4/lib/rails/commands/console.rb:8:in `start'
	from /opt/local/lib/ruby1.9/gems/1.9.1/gems/railties-3.0.4/lib/rails/commands.rb:23:in `<top (required)>'
	from script/rails:6:in `require'
	from script/rails:6:in `<main>'
irb(main):019:0>

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I am trying to do:
puts ActionController::Routing::Routes.draw do |map|
	map.resources :users
end.map(&:to_s).sort

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But I keep getting the above error. I am using Rails 3 on OSX.
LinuxInAtlantaAsked:
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kristinalimConnect With a Mentor Commented:
If you're trying to print out method names for an isolated set of routes, this should get you started:

route_set = ActionDispatch::Routing::RouteSet.new
route_set.draw { |map| map.resources :users }

# Unique names, without the _url nor _path
puts route_set.routes.map(&:name).uniq.compact.sort

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