ошибка с БД

Warning: session_start() [<a href='function.session-start'>function.session-start</a>]: Cannot send session cache limiter - headers already sent (output started at C:\OpenServer\domains\test.ru\files\db.php:1) in C:\OpenServer\domains\test.ru\files\db.php on line 4
вот код файла
<?php
defined('PROTECTOR') or die('Error: restricted access');

session_start();
$db_host = "localhost";
$db_user = "root";
$db_table = "game";
$db_pass = "******";
$connect = @ mysql_pconnect($db_host, $db_user, $db_pass) or die('cannot connect to server');
@ mysql_select_db($db_table) or die('cannot connect to db');
@ mysql_query("SET NAMES 'utf8'", $connect);

##################### ����� ������ � SQL ������� ################
@include('files/sql.php');
$stop_injection = new InitVars();
$stop_injection->checkVars();
##################### ����� ������ � SQL ������� ################

?>