Site not sending verification emails?

Hello all, my sites not sending out verification emails which is a big problem because I cant create my admin account because of it.

Ive tried to manual activate and it just says it sent but I dont receive any email and get a weird php error at the top

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home2/bestbuxn/public_html/giftcroc/includes/header.php:9) in /home2/bestbuxn/public_html/giftcroc/sessions.php on line 8

Code (markup):

If some one can help I would be so grateful.

Thanks

 

this error mostly come if something is being echoed before on page where redirection is done.
share your code to know exact error line

 

Make sure you have no spaces or line breaks before the session_start() function call. And no HTML either.

 

Don't include spaces or line breaks!

 

header.php must be included before any line like
<?php
include('header.php');
any other code here
?>

or remove session_start() from header.php
and write session_start() at the top of php page like
<?php
session_start();
any other code here
?>

also u can hide the error with error_reporting(0) like
<?php
code code
error_reporting(0);
code
?>

hope ugot it