ho questo codice:

codice:
<?php
session_start();
if($_SESSION["login"]=="0")
{
?>
   ....tabella con form di login
<?php
}
else {

include "config.inc";
include "connect.php";

?>
    .....tabella con msg di benvenuto
<? } ?>
Ma ricevo questi errori:

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at c:\programmi\easyphp1-8\www\microshop\index.php:20) in c:\programmi\easyphp1-8\www\microshop\mod_login.php on line 2

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at c:\programmi\easyphp1-8\www\microshop\index.php:20) in c:\programmi\easyphp1-8\www\microshop\mod_login.php on line 2

Notice: Undefined index: login in c:\programmi\easyphp1-8\www\microshop\mod_login.php on line 3