Estou desenvolvendo um sistema de b2b com telas de cadastros etc..., estou usando o dreaweaver cs3. Criei uma rotina de loggin utilizando a ferramenta do dreaweaver com o user authentication.
Quando coloco restrict acess to page numa rotina e tento acessa-la, recebe o seguinte erro. (Cannot send session cache limiter - headers already sent). Procurei alguma solucao na web mas todas recomendadas nao se aplicavam ao meu problema, que era espacos em braco, alguma chamada header antes do session_start, echo ou algo assim. Tambem veriquei no php.ini e o comando session_start = 0 esta la. Nao sei o que fazer. Segue um pedaco do script.
<?php if (!isset($_SESSION)) { session_start();}
$MM_authorizedUsers = "999,99,9";
$MM_donotCheckaccess = "false";

// *** Restrict Access To Page: Grant or deny access to this page
function isAuthorized($strUsers, $strGroups, $UserName, $UserGroup) {
// For security, start by assuming the visitor is NOT authorized.
$isValid = False;

// When a visitor has logged into this site, the Session variable MM_Username set equal to their username.
// Therefore, we know that a user is NOT logged in if that Session variable is blank.
if (!empty($UserName)) {
// Besides being logged in, you may restrict access to only certain users based on an ID established when they login.
// Parse the strings into arrays.
$arrUsers = Explode(",", $strUsers);
$arrGroups = Explode(",", $strGroups);
if (in_array($UserName, $arrUsers)) {
$isValid = true;
}
// Or, you may restrict access to only certain users based on their username.
if (in_array($UserGroup, $arrGroups)) {
$isValid = true;
}
if (($strUsers == "") && false) {
$isValid = true;
}
}
return $isValid;
}

$MM_restrictGoTo = "../../4_Pages/negado.php";
if (!((isset($_SESSION['MM_Username'])) && (isAuthorized("",$MM_authorizedUsers, $_SESSION['MM_Username'], $_SESSION['MM_UserGroup'])))) {
$MM_qsChar = "?";
$MM_referrer = $_SERVER['PHP_SELF'];
if (strpos($MM_restrictGoTo, "?")) $MM_qsChar = "&";
if (isset($QUERY_STRING) && strlen($QUERY_STRING) > 0)
$MM_referrer .= "?" . $QUERY_STRING;
$MM_restrictGoTo = $MM_restrictGoTo. $MM_qsChar . "accesscheck=" . urlencode($MM_referrer);
header("Location: ". $MM_restrictGoTo);
exit;
}
?>
Isto tudo e criado pelo dreamweaver no restrict acess to page.

Obrigado

posta o erro exatamente como foi gerado.