Try
require('url');
and with () around it:
<?php require('Includes/Header.html'); ?> <?php require('Includes/Feader.html'); ?>
Also make sure that your folder actually includes uppercase i and make sure that the header and footer are also uppercase in reality.
I really recommend NOT using uppercase in folders and file names; he becomes more merciless. An exception will be for CLASSES, functions and files must (to avoid errors) begin with a lowercase letter, but classes must begin with an uppercase.
Return to requirement:
A website should crash if the required file is not found, so you can make sure that a specific file is actually required.
If this does not work, you will probably have to check your PHP configurations. If you are not using a local project project, you should consider changing the web service if you cannot contact the service provider or change it yourself.
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