Warning: require_once(../tool/sms/sms.class.php): failed to open stream: No such file or directory in D:\Apache24\htdocs\center\php\register.php on line 2

Fatal error: require_once(): Failed opening required '../tool/sms/sms.class.php' (include_path='.;C:\php\pear') in D:\Apache24\htdocs\center\php\register.php on line 2