@barbarian

You must be missing an index.php inside your module directory. Just a small file with same name with the following code might do it:

<?php
header("Location: ../index.php");

Isn't this script purpose to redirect to index.php in parent folder if we only access the folder without any page?

You must be missing an index.php inside your module directory. Just a small file with same name with the following code might do it:

<?php
header("Location: ../index.php");

What happened here? This is the first time I encounter this problem.