тъпото Cannot modify header information

IzKuFeLiQqQqQ

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здравейте направих една системка и почнах да и слагам дизаин но се появи проблем като вляза в един линк и ми изписва

Warning: Cannot modify header information - headers already sent by (output started at /home/sunnybgi/public_html/files/config.php:13) in /home/sunnybgi/public_html/files/fav.php on line 17

това ми е fav.php
Код:
<?php  
session_start();
define('IN_VALID', true);
include ("config.php");
$ses = session_id();
@$query = mysql_query("SELECT * FROM `users` WHERE session='$ses'");
@$red = mysql_num_rows($query);
if ($red != NULL){
$my_id = mysql_result($query, "0", "id");
$my_ime = mysql_result($query, "0", "username");
$m_id = (int)$_GET['m_id'];
if(!$m_id AND !$v_id AND !$f_id) {echo 'Нямате пряк достъп! <META HTTP-EQUIV="Refresh" CONTENT="0; URL=../index.php ">';}
if($m_id AND !$v_id AND !$f_id) {
$q = mysql_query("INSERT INTO `favorites` (`fav_th`,`u_fav_id`,`fav_type`) VALUES ('$m_id','$my_id','m');")or die(mysql_error());
header("Location:../song.php?id=$m_id");//17 ред
}

и config
Код:
<?php
$host="localhost";
$dbusername="aha";
$dbpassword="da";
$db="ti si ko4";

$db_conn = mysql_connect("$host", "$dbusername", "$dbpassword")or die("Не мога да се свържа с BD!");

$conn=mysql_select_db("$db", $db_conn) or die("Не мога да се свържа с BD!");

mysql_query("SET NAMES UTF8"); 
date_default_timezone_set('Europe/Sofia');
?> //13 ред !!!

някои ще ми каже ли откъде идва проблема ?
 
<?php
ob_start();
session_start();
define('IN_VALID', true);
include ("config.php");
$ses = session_id();
@$query = mysql_query("SELECT * FROM `users` WHERE session='$ses'");
@$red = mysql_num_rows($query);
if ($red != NULL){
$my_id = mysql_result($query, "0", "id");
$my_ime = mysql_result($query, "0", "username");
$m_id = (int)$_GET['m_id'];
if(!$m_id AND !$v_id AND !$f_id) {echo 'Нямате пряк достъп! <META HTTP-EQUIV="Refresh" CONTENT="0; URL=../index.php ">';}
if($m_id AND !$v_id AND !$f_id) {
$q = mysql_query("INSERT INTO `favorites` (`fav_th`,`u_fav_id`,`fav_type`) VALUES ('$m_id','$my_id','m');")or die(mysql_error());
header("Location:../song.php?id=$m_id");//17 ред
}

?
 
Код:
<?php
$host="localhost";
$dbusername="aha";
$dbpassword="da";
$db="ti si ko4";

$db_conn = mysql_connect("$host", "$dbusername", "$dbpassword")or die("Не мога да се свържа с BD!");

$conn=mysql_select_db("$db", $db_conn) or die("Не мога да се свържа с BD!");

mysql_query("SET NAMES UTF8");
?>

?
 

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