我有 Rails Rails 2.3.8 和 Devise 1.0.8。我已按照安装说明进行操作，但是在修改 routes.rb 后第一次尝试访问 /users/sign_in 时，我得到了
Internal Server Error
undefined method `[]' for :users:Symbol
当我重新加载时，我得到
Routing Error
No route matches "/users/sign_up" with {:method=>:get}
如果放在map.devise_for :users其他map.s 之上，我在尝试访问例如 /artists 或 /songs 时会遇到相同类型的路由错误。
我错过了什么吗？
更新：这是完整的输出rake routes
new_user_session GET /users/sign_in {:controller=>"sessions", :action=>"new"}
user_session POST /users/sign_in {:controller=>"sessions", :action=>"create"}
destroy_user_session GET /users/sign_out {:controller=>"sessions", :action=>"destroy"}
new_user_password GET /users/password/new(.:format) {:controller=>"passwords", :action=>"new"}
edit_user_password GET /users/password/edit(.:format) {:controller=>"passwords", :action=>"edit"}
user_password PUT /users/password(.:format) {:controller=>"passwords", :action=>"update"}
POST /users/password(.:format) {:controller=>"passwords", :action=>"create"}
new_user_registration GET /users/sign_up(.:format) {:controller=>"registrations", :action=>"new"}
edit_user_registration GET /users/edit(.:format) {:controller=>"registrations", :action=>"edit"}
user_registration PUT /users(.:format) {:controller=>"registrations", :action=>"update"}
DELETE /users(.:format) {:controller=>"registrations", :action=>"destroy"}
POST /users(.:format) {:controller=>"registrations", :action=>"create"}
songs GET /songs(.:format) {:controller=>"songs", :action=>"index"}
POST /songs(.:format) {:controller=>"songs", :action=>"create"}
new_song GET /songs/new(.:format) {:controller=>"songs", :action=>"new"}
edit_song GET /songs/:id/edit(.:format) {:controller=>"songs", :action=>"edit"}
song GET /songs/:id(.:format) {:controller=>"songs", :action=>"show"}
PUT /songs/:id(.:format) {:controller=>"songs", :action=>"update"}
DELETE /songs/:id(.:format) {:controller=>"songs", :action=>"destroy"}
artist_songs GET /artists/:artist_id/songs(.:format) {:controller=>"songs", :action=>"index"}
POST /artists/:artist_id/songs(.:format) {:controller=>"songs", :action=>"create"}
new_artist_song GET /artists/:artist_id/songs/new(.:format) {:controller=>"songs", :action=>"new"}
edit_artist_song GET /artists/:artist_id/songs/:id/edit(.:format) {:controller=>"songs", :action=>"edit"}
artist_song GET /artists/:artist_id/songs/:id(.:format) {:controller=>"songs", :action=>"show"}
PUT /artists/:artist_id/songs/:id(.:format) {:controller=>"songs", :action=>"update"}
DELETE /artists/:artist_id/songs/:id(.:format) {:controller=>"songs", :action=>"destroy"}
artists GET /artists(.:format) {:controller=>"artists", :action=>"index"}
POST /artists(.:format) {:controller=>"artists", :action=>"create"}
new_artist GET /artists/new(.:format) {:controller=>"artists", :action=>"new"}
edit_artist GET /artists/:id/edit(.:format) {:controller=>"artists", :action=>"edit"}
artist GET /artists/:id(.:format) {:controller=>"artists", :action=>"show"}
PUT /artists/:id(.:format) {:controller=>"artists", :action=>"update"}
DELETE /artists/:id(.:format) {:controller=>"artists", :action=>"destroy"}
root / {:controller=>"home", :action=>"index"}
/:controller/:action/:id
/:controller/:action/:id(.:format)