recaptcha不能在rails3.1上工作

Question

我正在开发一个新的rails项目并使用设备和omniauth recaptcha gem并且我不断收到此消息＆＃34;无法达到重新捕获＆＃34;

我的控制器代码如下

def create
  if session[:omniauth] == nil #OmniAuth
    if verify_recaptcha
      super
      session[:omniauth] = nil unless @user.new_record? #OmniAuth
    else
      build_resource
      clean_up_passwords(resource)
      flash[:notice] = "There was an error with the recaptcha code below. Please re-enter the code and click submit."
      render_with_scope :new
    end
  else
    super
    session[:omniauth] = nil unless @user.new_record? #OmniAuth
  end

end