我运行手册中的示例代码出错

fenghao@fenghao-pc:~/文档/TEST$ sudo php http_test.php start
PHP Warning:  require_once(./Workerman/Autoloader.php): failed to open stream: No such file or directory in /home/fenghao/文档/TEST/http_test.php on line 3
PHP Fatal error:  require_once(): Failed opening required './Workerman/Autoloader.php' (include_path='.:/usr/share/php:/usr/share/pear') in /home/fenghao/文档/TEST/http_test.php on line 3