Error On $ShoppingCart

This is the error message I get:

Warning: Cannot modify header information - headers already sent by (output started at /home/content/w/d/h/wdhobbs/html/homeschoollife/store.php:9) in /home/content/w/d/h/wdhobbs/html/homeschoollife/store.php on line 114

This is the script at that location:

<?php
// WA eCart Redirect
if ($ShoppingCart->redirStr != "") {
header("Location: ".$ShoppingCart->redirStr); <-----This is line 114
}
?>

I appear to be having problems on all pages that have $ShoppingCart in them any ideas what might be the problem?

this error occurs when there is output top the page before the header function is called.


according to the error, the output was started around line 9, it's probably on line 8 though:

output started at /home/content/w/d/h/wdhobbs/html/homeschoollife/store.php:9


In most cases, the error is causes by blank space between a closing PHP tag "?>" and the next opening PHP tag "<?php"

it can be a blanks space at the end of the line:
"?> "

or a blank line between the two:
?>

<?php

look at lines 8 and 9 to find the output that is causing the error.