Checkout Confirmation Error

Hi,

On my checkout screen, when I click confirm order, I get the following error...

Notice: Undefined index: shipping_address in /home/shoetoria/public_html/ecommerce/catalog/controller/checkout/confirm.php on line 167Warning: Cannot modify header information - headers already sent by (output started at /home/shoetoria/public_html/ecommerce/index.php:100) in /home/shoetoria/public_html/ecommerce/system/engine/controller.php on line 28Warning: Cannot modify header information - headers already sent by (output started at /home/shoetoria/public_html/ecommerce/index.php:100) in /home/shoetoria/public_html/ecommerce/system/engine/controller.php on line 29

What does this mean and how can I fix it? I'm using version 5.4.1

Thanks.

I got this issue fixed... no need to reply.