这是我的形式：

%h2 Sign up
= simple_form_for(resource,:as => resource_name,:url => registration_path(resource_name),:html => {:class => 'form-vertical' }) do |f|
  = f.error_notification
  = display_base_errors resource
  = f.input :name,:autofocus => true
  = f.button :submit,'Sign up',:class => 'btn-primary'
= render "devise/shared/links"

这是我的user_steps.rb

When /^I sign up with valid user data$/ do
  create_visitor
  sign_up
end

def create_visitor
  @visitor ||= { :name => "Test visitor"}
end

def sign_up
  visit '/users/sign_up'
  fill_in "Name",:with => @visitor[:name]
  click_button "Sign up"
end

怎么了？？？？