[PHP]problem z session_start(); Opcje

[AniaR]

Moj panel logowania wyglada tak:

[PHP] pobierz, plaintext 
<?
	session_start();
	require_once ("DBConnection.php");
	if (count($_GET) > 0 && isset($_GET['logout'])) {
		$logout = $_GET['logout'];
		if ($logout == "t") {
			unset($_SESSION['username']);
			unset($_SESSION['password']);
			unset($_SESSION['role']);
			header("Location: login.php");
		}
	} else {
		$connection = new DBConnection();
		$connection->open();
		if (count($_POST) > 0 && !isset($_POST['msg']) ) {
			$login=$_POST['login'];
			$password=$_POST['password'];
			if ($login==null || $password==null)
			{
				header("Location: login.php?msg=emptyfield");
			}
			else {
				$query = "SELECT login, haslo FROM uzytkownik WHERE login = '$login' and rola = 'A'";
				$connection->executeQuery($query);
                $count = $connection->rowsCount();
				if ($count == 0) {
				    header("Location: login.php?msg=error");
				}
				else {
					$line = $connection->fetchAssoc();
					$password_db = $line['haslo'];
					if ($password <> $password_db) {
				        header("Location: login.php?msg=error");
					}
					else {
						$_SESSION['username'] = $line['login'];		
						$_SESSION['password'] = $line['haslo'];			
						$_SESSION['role'] = "admin";
 						header("Location: aktualnosci.php");
					}
				}
			}
		}
		$connection->close();
	}
?> 
[PHP] pobierz, plaintext 

Z dzialalo to i dziala mi na roznych serwerach.. Jednak z jednym nie chce dzialac i nie mam pojecia dlaczego?? Pokazuja sie takie błędy:


Warning: session_start() [function.session-start]: open(/tmp/sess_5cba1cc3210030e6e106f4dbc8e474c2, O_RDWR) failed: No such file or directory (2) in /clients/majka/_mjadmin/login.php on line 1

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /clients/majka/_mjadmin/login.php:1) in /clients/majka/_mjadmin/login.php on line 1

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /clients/majka/_mjadmin/login.php:1) in /clients/majka/_mjadmin/login.php on line 1

Warning: Unknown: open(/tmp/sess_5cba1cc3210030e6e106f4dbc8e474c2, 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


Czy ktos ma pomysl o co chodzi?