Mikedrums

Olá amigo Balala td b???? Acheu muito bom seu tutorial, mas travei num erro

Warning: Cannot modify header information - headers already sent by (output started at /home/iblonlin/public_html/arearestrita/config.php:9) in /home/iblonlin/public_html/arearestrita/confirmar_login.php on line 11

Warning: Cannot modify header information - headers already sent by (output started at /home/iblonlin/public_html/arearestrita/config.php:9) in /home/iblonlin/public_html/arearestrita/confirmar_login.php on line 12

Warning: Cannot modify header information - headers already sent by (output started at /home/iblonlin/public_html/arearestrita/config.php:9) in /home/iblonlin/public_html/arearestrita/confirmar_login.php on line 13

não consigo identificar qual o erro, poderia me ajudar, sou novato em php/mysql.

Desde já agradeço.... Obrigado