The version I use is Zen Cart 1.3.7

When customer log in the following page appear:

Warning: session_regenerate_id() [function.session-regenerate-id]: Cannot regenerate session id - headers already sent in /home/mark8/public_html/zen-cart/includes/functions/sessions.php on line 162

Warning: Cannot modify header information - headers already sent by (output started at /home/mark8/public_html/zen-cart/includes/modules/create_account.php:430) in /home/mark8/public_html/zen-cart/includes/functions/functions_general.php on line 44


After refresh the browser, will back to normall,
This problem been here a few month. I have no idea
Would anyone please give me tips!! thanks advance