How to use the pyvirtualdisplay.xauth.NotFoundError function in PyVirtualDisplay

self._is_started = False

        helptext = get_helptext(program)
        self._has_displayfd = "-displayfd" in helptext
        if not self._has_displayfd:
            log.debug("-displayfd flag is missing.")
        # if check_startup and not has_displayfd:
        #     check_startup = False
        #     log.warning(
        #         program
        #         + " -displayfd flag is not supported, 'check_startup' parameter has been disabled"
        #     )
        self._check_flags(helptext)

        if use_xauth and not xauth.is_installed():
            raise xauth.NotFoundError()

        self._use_xauth = use_xauth
        self._old_xauth = None
        self._xauth_filename = None
        # self.check_startup = check_startup