Erreur PHP site (Free)

Bonjour, j'ai un problème sur mon site lorsque je renseigne un mot de passe erroné, voici l'erreur:

"Warning: session_destroy() [function.session-destroy]: Session object destruction failed in /mnt/102/sdb/a/b/monsite/lib/Session.class.php on line 561

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /mnt/102/sdb/a/b/monsite/lib/Session.class.php:561) in /mnt/102/sdb/a/b/monsite/lib/Session.class.php on line 564

Warning: session_regenerate_id() [function.session-regenerate-id]: Cannot send session cookie - headers already sent by (output started at /mnt/102/sdb/a/b/monsite/lib/Session.class.php:561) in /mnt/102/sdb/a/b/monsite/lib/Session.class.php on line 565

Warning: Cannot modify header information - headers already sent by (output started at /mnt/102/sdb/a/b/monsite/lib/Session.class.php:561) in /mnt/102/sdb/a/b/monsite/login.php on line 130"

Voici le fichier "Sessions.classe.php":
"
550: }

// Détruit toutes les variables de session
session_unset();
$_SESSION = array();

// Détruit le cookie sur le navigateur
$CookieInfo = session_get_cookie_params();
@setcookie(session_name(), '', time()-3600, $CookieInfo['path']);

// détruit la session sur le serveur
session_destroy();

//on redémarre une nouvelle session
session_start();
session_regenerate_id();
566: }
"

Merci !