# File lib/openid/kvpost.rb, line 18
    def self.from_message(msg, server_url)
      error_text = msg.get_arg(OPENID_NS, 'error',
                               '<no error message supplied>')
      error_code = msg.get_arg(OPENID_NS, 'error_code')
      return self.new(error_text, error_code, msg, server_url)
    end