Pb after installation with function session start

Hello,
After smooth installation on a new server I got these warnings :

Warning: session_start() [function.session-start]: open(/web/lyonjalousie/session/sess_50458ce3701bcaeb7db2ebec1534d472, O_RDWR) failed: No such file or directory (2) in /web/lyonjalousie/www/dolibarr/htdocs/main.inc.php on line 136

Warning: Unknown: open(/web/lyonjalousie/session/sess_50458ce3701bcaeb7db2ebec1534d472, 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 (/web/lyonjalousie/session) in Unknown on line 0

The installation went good but I got hte above mentionned warnings. If I enter dolibarr I am not able to key in datas as after validation the application exit alone :unhappy:

Could you help me in solving this ?

Thanks in advance

This is not a pb in dolibarr but into your PHP installation.
Take a look into your php.ini file to find directory used to store session files. Then check on your disk this directory exists and is writable by your apache user.