no message appear using drupal_set_message :-(

Hi,
Thanks for the reply. Its already there in my template but the message does not appear.

and this is the function from signup_pay module that should display if a user has already paid, but it is not:function signup_pay_do_payment() {
global $user;

// Get method and node, from session
$nid = $_SESSION['signup_pay_nid'];
$method = $_SESSION['signup_pay_method'];
$anon = $_SESSION['signup_pay_anon_mail'];

// Check if user has already paid
if (signup_pay_check_payment($nid, $anon)) {
drupal_set_message(t('You have already paid for this event.'));
return;
}

// Check if it is Paypal
if ($method == SIGNUP_PAY_METHOD_PAYPAL) {
$data = array(
'uid' => $user->uid,
'nid' => $nid,
'mail' => $anon,
);
return signup_pay_do_paypal($data);
}
}

If I replace
drupal_set_message(t('You have already paid for this event.'));
with
echo 'You have already paid for this event'; exit;

it displays it. but it should display it through the function, unfortunately it is not.

Regards

It finally worked:
replaced

if ($show_messages): print $messages; endif;

with

if ($messages): print $messages; endif;

Thanks