救命呀，大哥们！！！！解决了立即结分

我的php出问题了：我在公司的局域网内建了个php网站，原来用的好好的，今天

我打开一个网页要登陆，却出现了问题,如下：
Warning: session_start() [function.session-start]: open(/tmp\sess_c608094857a58b859e6559fa2b24147d, O_RDWR) failed: No such file or directory (2) in d:\ywyt\yw\admin\login.php on line 11

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at d:\ywyt\yw\admin\login.php:11) in d:\ywyt\yw\admin\login.php on line 11

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at d:\ywyt\yw\admin\login.php:11) in d:\ywyt\yw\admin\login.php on line 11

Warning: Cannot modify header information - headers already sent by (output started at d:\ywyt\yw\admin\login.php:11) in d:\ywyt\yw\admin\login.php on line 47

中间是我的登陆对话框

Warning: Unknown(): open(/tmp\sess_c608094857a58b859e6559fa2b24147d, O_RDWR) failed: No such file or directory (2) in Unknown on line 0

Warning: Unknown(): Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0

请问是什么问题呀，各位大哥！