usps.php error

[GERob]

I am running 1.3.7

I installed the new usps.php file to correct the shipping problems and now I get the following error:

Fatal error: Cannot redeclare class usps in /home/skycandl/public_html/includes/modules/shipping/usps.php on line 13

This is the code:

<?php
/**
 * @package shippingMethod
 * @copyright Copyright 2003-2007 Zen Cart Development Team
 * @copyright Portions Copyright 2003 osCommerce
 * @license [url]http://www.zen-cart.com/license/2_0.txt[/url] GNU Public License V2.0
 * @version $Id: usps.php 6474 2007-11-18 15:59:32Z ajeh $
 */
/**
 * USPS Shipping Module class
 *
 */
class usps extends base {
  /**
   * Declare shipping module alias code
   *
   * @var string
   */
  var $code;

I've tried changing class usps extends base { to class usps { but that didn't fix anything. I had uninstalled the module before installing the new file and I deleted the old file before uploading the new one.

Any help would be greatly appreciated.

Thank you,