-1

"internal server error"

wp-content/themes/xxxxxx/inc/custom-functions.php on line 529
4

It's obvious that error is in custom-functions.php line 529 where you might be using file system function outside of admin, you can fix this by includin core admin file.php file like this.

require_once(ABSPATH . 'wp-admin/includes/file.php');
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