route match error with 2 parameters

routes.db

match 'bugs/:pr/:scope/info' => 'bugs#info', :as=>:bug_info

rake routes

bug_info /bugs/:pr/:scope/info(.:format)
{:controller=>"bugs", :action=>"info"}

In my view i used bug_info_path(:pr=>1,:scope=>2) and i get an error

No route matches
{:scope=>"2", :action=>"info", :controller=>"bugs", :pr=>1}

What's wrong with the route? I have the controller, action and view
defined