Hi guys.

I get this error:
Warning: Cannot modify header information - headers already sent by (output started at /home/janrapha/public_html/UpdateToday/includes/overall/header.php:7) in /home/janrapha/public_html/UpdateToday/register.php on line 116
line 116 is this code.
Code:
header('location: register.php?success');
I got no error when I'm running the site in my localhost. But when I upload the files online, I got errors saying headers are already sent.
Please help.