private

  def authenticate_user
    @current_user = User.find_by_authentication_token(params[:token])
    unless @current_user
      error = { :error => "Invalid token." }
      respond_with(error,:status => 401 )
    end
  end

我正在调用API以确保身份验证失败.

我收到一个错误说明

ArgumentError (Nil location provided. Can't build URI.):
  app/controllers/api/v1/base_controller.rb:13:in `authenticate_user'

我究竟做错了什么？