Custom Login Page

Hi WP geeks.

I have a custom login page. I decided to code it and not to let user see the native wp-login.php.

In login page, when I key in the correct login details it gives me an error:

Warning: Cannot modify header information – headers already sent by (output started at /home/barefoot/public_html/wp-content/themes/bfa/header.php:2) in /home/barefoot/public_html/wp-includes/pluggable.php on line 680

but when I have incorrect logins it performs normally.

Hope there’s someone out there who could help me out on this.

Thanks everyone.