PHP-ban SESSION-t szeretnék létrehozni, de mindig valami könyvtárra hivatkozik, ötlet?

Ezt kapom vissza (atw-s a tárhely):

Warning: session_start() [function.session-start]: open(/tmp/sess_366ed3ec254c52bbf80f18ad491e16f5, O_RDWR) failed: No such file or directory (2) in /index.php on line 2

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /index.php:2) in /index.php on line 2

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /index.php:2) in /index.php on line 2

Warning: Unknown: open(/tmp/sess_366ed3ec254c52bbf80f18ad491e16f5, 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

Forrás:

include("connect.php");

if(isset($_POST["login_submit"])) {

$myusername=$_POST["user_login"];

$mypassword=$_POST["user_pass"];

$myusername = stripslashes($myusername);

$mypassword = stripslashes($mypassword);

$myusername = mysql_real_escape_string($myusername);

$mypassword = mysql_real_escape_string($mypassword);

$sql="SELECT * FROM user_login WHERE username='$myusername' and userpass='$mypassword'";

$result=mysql_query($sql);

$count=mysql_num_rows($result);

if($count==1){

$_SESSION["user_session"] = $myusername;

session_register("login_username");

}

else {

}

}