jasonwar

Hospedei meu trabalho de TCC, porém quando tento logar da esses erros:

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/headbang/public_html/valida.php:13) in /home/headbang/public_html/valida.php on line 30

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/headbang/public_html/valida.php:13) in /home/headbang/public_html/valida.php on line 30

Warning: Cannot modify header information - headers already sent by (output started at /home/headbang/public_html/valida.php:13) in /home/headbang/public_html/valida.php on line 37

Já no XAMPP roda normal, o que fazer? Alguém poderia me ajudar!!!!