Pb installation joomla sur serveur free

Bonsoir,

Il m'est impossible d'installer joomla sur le serveur de free ! une fois que j'ai transférer tous mes fichiers sur le serveur, quand je vais sur la page internet de mon site, il y a des messages d'erreurs :

Warning: session_start() [function.session-start]: open(/mnt/142/sda/6/3/nom_du_site/sessions/sess_e0d244621fc2827a12425c273d59eb0f, O_RDWR) failed: No such file or directory (2) in /mnt/142/sda/6/3/n.cedric/libraries/joomla/session/session.php on line 423

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /mnt/142/sda/6/3/nom_du_site/libraries/joomla/session/session.php:423) in /mnt/142/sda/6/3/n.cedric/libraries/joomla/session/session.php on line 423

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /mnt/142/sda/6/3/nom_du_site/libraries/joomla/session/session.php:423) in /mnt/142/sda/6/3/n.cedric/libraries/joomla/session/session.php on line 423

Warning: Cannot modify header information - headers already sent by (output started at /mnt/142/sda/6/3/nom_du_site/libraries/joomla/session/session.php:423) in /mnt/142/sda/6/3/n.cedric/libraries/joomla/session/session.php on line 426

Warning: session_write_close() [function.session-write-close]: open(/mnt/142/sda/6/3/nom_du_site/sessions/sess_e0d244621fc2827a12425c273d59eb0f, O_RDWR) failed: No such file or directory (2) in /mnt/142/sda/6/3/n.cedric/libraries/joomla/session/session.php on line 556

Warning: session_write_close() [function.session-write-close]: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/mnt/142/sda/6/3/nom_du_site/sessions) in /mnt/142/sda/6/3/n.cedric/libraries/joomla/session/session.php on line 556

j'utilise la version 1.5, quelqu'un a t-il une idée ?

Merci par avance pour votre aide

Cordialement

Moinaud