mysql的连接问题

Warning: session_start() [function.session-start]: open(/tmp\sess_7e1b88db7684d014081478de69b0a4ce, O_RDWR) failed: No such file or directory (2) in c:\apache\apache\htdocs\mysql\include\config.inc.php on line 2

请问连接时出现这样的是什么错误！