Downloadable Document from Secure Bucket Assets

<?php 
    include('perch/runtime.php'); 

    // config
    $bucket_name = 'secure';
    $url_param   = 'file';


    // By default, deny downloads unless we've proved the member is allowed this file.
    $allow_download = false;


    // Check a member is logged in
    if (perch_member_logged_in()) {
        $allow_download = true;
    }

    /*
    Alternatively, you could check for a specific tag, e.g.

    if (perch_member_has_tag('subscriber')) {
        $allow_download = true;
    }

    */


    // Deliver the file.
    if ($allow_download) {
        perch_members_secure_download(perch_get($url_param), $bucket_name);
    }

    exit;

The page goes blank with URL as: /members/download.php?file=/document.docx