Cannot send session cookie - headers already sent by

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at C:\Home\deneme.com\ugur.deneme.com\admin\index.php :1) in C:\Home\deneme.com\ugur.deneme.com\admin\index.php on line 2

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at C:\Home\deneme.com\ugur.deneme.com\admin\index.php :1) in C:\Home\deneme.com\ugur.deneme.com\admin\index.php on line 2

çıkan hata budur site adresim yerine ugur ve deneme yazısını kendim yazdım. bu sorunu nasıl aşabilirim şimdiden teşekkürler