I have a form validator in my formhandler

<?php 
include("include/session.php");
if(isset($_POST['submit'])){ 
include("connect.php"); 

  $message = array(); 
//validate your form data 
if (empty($_POST['firstname'])) { 

    $message[] = '<p>You forgot to enter your first name!</p>'; 
} 

// Check for an second name. 
if (empty($_POST['secondname'])) { 

     $message[] = '<p>You forgot to enter your second name</p>'; 
} 

   if (empty($_POST['organisation'])) { 

     $message[] = '<p>You forgot to enter your organisation</p>'; 
} 

if(count($message) > 0){ 
      //hold the error in session so you can display the error in your form page. 
      $_SESSION['message'] = $message; 

//redirect to the form 
	header("Location: 			http://www.mindseyemidlands.co.uk/notts_quality/info_resource/selfassess_part1a_v1.php");        

} 

else {

and when the redirect takes place the errors should echo but they don't

<?php
//if form validation errors exists, list them out
if(isset($_SESSION['message']) && (count($_SESSION['message']) > 0)) {
	echo '<ul>';
	foreach($_SESSION['message'] as $message){
  	echo '<li>'.$message.'</li>';
 	}
 	echo '</ul>';
}
?>

how come the error message is not echoed?

    Do you have session_start() on every page where you use sessions?

      yes- where I have include session.php on top of each page there is a reference to session_start() in session.php

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