strange login admin error

from some days I can't login into my zencart, because at the login page, appear an error page instead of normal login page and I don't understand what is happen and what is wrong:
http://www.estufe.com/admin/login.php

Warning: main(/home/hotelsup/public_html/stufe/includes/autoload_func.php): failed to open stream: No such file or directory in /home/domains/estufe.com/web/admin/includes/application_top.php on line 149

Warning: main(/home/hotelsup/public_html/stufe/includes/autoload_func.php): failed to open stream: No such file or directory in /home/domains/estufe.com/web/admin/includes/application_top.php on line 149

Fatal error: main(): Failed opening required '/home/hotelsup/public_html/stufe/includes/autoload_func.php' (include_path='.:/usr/lib/php/:/usr/share/pear/') in /home/domains/estufe.com/web/admin/includes/application_top.php on line 149

Check or reload /home/hotelsup/public_html/stufe/includes/autoload_func.php

I tryed to check, but I?m not a php expert I reuploaded it , but all remain the same..
here the code:

<?php
/**
* File contains the autoloader loop
*
* The autoloader loop takes the array from the auto_loaders directory
* and uses this this to constuct the InitSysytem.
* see {@link http://www.zen-cart.com/wiki/index.php/Developers_API_Tutorials#InitSystem} for more details.
*
* @package initSystem
* @copyright Copyright 2003-2006 Zen Cart Development Team
* @copyright Portions Copyright 2003 osCommerce
* @license http://www.zen-cart.com/license/2_0.txt GNU Public License V2.0
* @version $Id: autoload_func.php 4387 2006-09-04 13:54:28Z drbyte $
*/
if (!defined('IS_ADMIN_FLAG')) {
die('Illegal Access');
}
reset($autoLoadConfig);
ksort($autoLoadConfig);
foreach ($autoLoadConfig as $actionPoint => $row) {
$debugOutput = "";
foreach($row as $entry) {
$debugOutput = 'actionPoint=>'.$actionPoint . ' ';
// $entry['loadFile'] = str_replace(array(':', '\\\\'), '', $entry['loadFile']);
switch($entry['autoType']) {
case 'include':
/**
* include a file as specified by autoloader array
*/
if (file_exists($entry['loadFile'])) include($entry['loadFile']);
$debugOutput .= 'include(\'' . $entry['loadFile'] . '\');' . '<br />';
break;
case 'require':
/**
* require a file as specified by autoloader array
*/
if (file_exists($entry['loadFile'])) require($entry['loadFile']);
$debugOutput .= 'require(\'' . $entry['loadFile'] . '\');' . '<br />';
break;
case 'init_script':
$baseDir = DIR_WS_INCLUDES . 'init_includes/';
if (file_exists(DIR_WS_INCLUDES . 'init_includes/overrides/' . $entry['loadFile'])) {
$baseDir = DIR_WS_INCLUDES . 'init_includes/overrides/';
}
/**
* include an init_script as specified by autoloader array
*/
if (file_exists($baseDir . $entry['loadFile'])) include($baseDir . $entry['loadFile']);
$debugOutput .= 'include(\'' . $baseDir . $entry['loadFile'] . '\');' . '<br />';
break;
case 'class':
if (isset($entry['classPath'])) {
$classPath = $entry['classPath'];
} else {
$classPath = DIR_FS_CATALOG . DIR_WS_CLASSES;
}
/**
* include a class definition as specified by autoloader array
*/
if (file_exists($classPath . $entry['loadFile'])) include($classPath . $entry['loadFile']);
$debugOutput .= 'include(\'' . $classPath . $entry['loadFile'] . '\');' . '<br />';
break;
case 'classInstantiate':
$objectName = $entry['objectName'];
$className = $entry['className'];
if (isset($entry['classSession']) && $entry['classSession'] === true) {
if (isset($entry['checkInstantiated']) && $entry['checkInstantiated'] === true) {
if (!isset($_SESSION[$objectName])) {
$_SESSION[$objectName] = new $className();
$debugOutput .= 'if (!$_SESSION[' . $objectName . ']) { ';
$debugOutput .= '$_SESSION[' . $objectName . '] = new ' . $className . '();';
$debugOutput .= ' }<br />';
}
} else {
$_SESSION[$objectName] = new $className();
$debugOutput .= ' $_SESSION[' . $objectName . '] = new ' . $className . '();<br />';
}
} else {
$$objectName = new $className();
$debugOutput .= '$' . $objectName . ' = new ' . $className . '();<br />';
}
break;
case 'objectMethod':
$objectName = $entry['objectName'];
$methodName = $entry['methodName'];
if (is_object($_SESSION[$objectName])) {
$_SESSION[$objectName]->$methodName();
$debugOutput .= '$_SESSION[' . $objectName . ']->' . $methodName . '();<br />';
} else {
$$objectName->$methodName();
$debugOutput .= '$' . $objectName . '->' . $methodName . '();<br />';
}
break;
}
if (DEBUG_AUTOLOAD === true) echo $debugOutput;
}
}
?>