session variables for sub sub folders

this is how I am trying to include
<?php
/* Path: active/modules/scheduling/scheduler_view1.php /
@session_start();

// 1. Point specifically to the session folder used by your main site
@session_save_path(dirname(FILE, 4) . "/templates_c");
@session_name("PHPRunner");
@session_start();

// 2. The Sandbox Security Check
if (!isset($_SESSION["UserID"]) || empty($_SESSION["UserID"])) {
echo "<div style='background:#ff7675; color:white; padding:20px; text-align:center; font-family:sans-serif; border:5px solid #d63031;'>";
echo "## ⚠️ Sandbox Security: Session Not Found";
echo "Current Session Status: <b>Disconnected</b>
";
echo "Please ensure you have a logged-in tab open on the main site.";
echo "

<a href='https://popeyes.restaurants4u.ca/login.php' target='_blank' style='background:white; color:#d63031; padding:10px 20px; text-decoration:none; border-radius:5px; font-weight:bold;'>Open Main Login</a>";
echo "</div>";
exit();
}

Check this artcile, section "Accessing PHPRunner session variables from external PHP files"
https://xlinesoft.com/phprunner/docs/how_to_add_external_files.htm