问设置Authlogic我一直点击：“用于#<UserSession的未定义方法‘登录’：没有凭据provided>”

EN

undefined method `login' for #<UserSession: no credentials provided>
Extracted source (around line #7):

5:   <%= form_for(:user_session, :url => user_session_path) do |f| %>
6:     <%= f.label :login %><br>
7:     <%= f.text_field :login %><br>
8:     <%= f.password_field(:password) %>   
9:     <%= f.submit %>
10:   <% end %>

class User < ActiveRecord::Base

  attr_accessible :password, :password_confirmation
  acts_as_authentic do |c|
    c.login_field = :email
  end
end

class UserSessionsController < ApplicationController  
  def new
    @user_session = UserSession.new
  end

  # ...
end

<%= form_for(:user_session, :url => user_session_path) do |f| %>
  <%= f.label :login %><br>
  <%= f.text_field :login %><br>
  <%= f.password_field(:password) %>   
  <%= f.submit %>
<% end %>

class UserSession < Authlogic::Session::Base
   # configuration here, see documentation for sub modules of Authlogic::Session
end

create_table "sessions", :force => true do |t|
  t.string   "session_id", :null => false
  t.text     "data"
  t.datetime "created_at"
  t.datetime "updated_at"
end

add_index "sessions", ["session_id"], :name => "index_sessions_on_session_id"
add_index "sessions", ["updated_at"], :name => "index_sessions_on_updated_at"

create_table "users", :force => true do |t|
  t.string   "email"
  t.datetime "created_at"
  t.datetime "updated_at"
  t.string   "first_name"
  t.string   "last_name"
  t.string   "crypted_password"
  t.string   "password_salt"
  t.string   "persistence_token"
end