PHP Site taşıma sonrası hata alıyorum

Notice: Undefined variable: _SESSION in /home/puwtfmps/public_html/sys/config.php on line 17

Warning: Invalid argument supplied for foreach() in /home/puwtfmps/public_html/sys/config.php on line 17

<?php
foreach($_POST as $Key => $Value):
    $Value = strip_tags($Value);
    $_POST[$Key] = $Value;
endforeach;

foreach($_GET as $Key => $Value):
    $Value = strip_tags($Value);
    $_GET[$Key] = $Value;
endforeach;

foreach($_REQUEST as $Key => $Value):
    $Value = strip_tags($Value);
    $_REQUEST[$Key] = $Value;
endforeach;

foreach($_SESSION as $Key => $Value):
    $Value = strip_tags($Value);
    $_SESSION[$Key] = $Value;
endforeach;

foreach($_COOKIE as $Key => $Value):
    $Value = strip_tags($Value);
    $_COOKIE[$Key] = $Value;
endforeach;
error_reporting(0);