What could be causing the error message "Warning: Unable to create 'http://www.familie-moehn.de/sebastian/free/files/buch.zip': No such file or directory" in the PHP script?

The error message "Warning: Unable to create 'http://www.familie-moehn.de/sebastian/free/files/buch.zip': No such file or directory" indicates that the PHP script is trying to create or access a file that does not exist at the specified URL. This could be due to incorrect file path, permissions issue, or the file simply not being present at the given location. To resolve this issue, ensure that the file path is correct and the file exists at the specified URL.

<?php
$file_url = 'http://www.familie-moehn.de/sebastian/free/files/buch.zip';
$file_name = basename($file_url);
$file = fopen($file_url, 'r');

if ($file) {
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="' . $file_name . '"');
    fpassthru($file);
    exit;
} else {
    echo 'File not found.';
}
?>