bhe questo è un errore di programmazione... hai toccato il file, dì la verita!!! 
)
cmnq posta le ultime 30 righe di quel file. manca una parentesi graffa da qualche parte!
sarà semplice
In realtà non ho toccato la pagina Ad ogni modo questo è il file
<?php
/**
* Magento
*
* NOTICE OF LICENSE
*
* This source file is subject to the Academic Free License (AFL 3.0)
* that is bundled with this package in the file LICENSE_AFL.txt.
* It is also available through the world-wide-web at this URL:
* http://opensource.org/licenses/afl-3.0.php
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@magentocommerce.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade Magento to newer
* versions in the future. If you wish to customize Magento for your
* needs please refer to http://www.magentocommerce.com for more information.
*
* @category design
* @package base_default
* @copyright Copyright (c) 2012 Magento Inc. (http://www.magentocommerce.com)
* @license http://opensource.org/licenses/afl-3.0.php Academic Free License (AFL 3.0)
*/
/**
* @var Mage_Page_Block_Html_Header $this
*/
?>
<?php $home_url = Mage::helper('core/url')->getHomeUrl(); ?>
<div class="container">
<div class="row switcherrow">
<div class="languageswitcher"><?php echo $this->getChildHtml('store_language') ?><?php echo $this->getChildHtml('currencyselector') ?></div>
</div>
</div>
<script>
var tpj=jQuery;
tpj.noConflict();
tpj(document).ready(function() {
if (tpj.fn.cssOriginal!=undefined)
tpj.fn.css = tpj.fn.cssOriginal;
tpj('.banner').revolution(
{
delay:9000,
startheight:330,
startwidth:1240,
fullWidth:"on"
});
});
</script>
<div class="container">
<div class="row maincontainer">
<header>
<div class="row">
<section id="upperpart">
<div class="container">
<div class="row">
<a href="<?php echo $this->getUrl('') ?>" title="<?php echo $this->getLogoAlt() ?>" class="logo"><img src="<?php echo $this->getLogoSrc() ?>" alt="<?php echo $this->getLogoAlt() ?>" /></a>
<nav class="toplinks">
<ul id="tops">
<?php echo $this->getLayout()->createBlock('cms/block')->setBlockId('topnavigation')->toHtml() ?>
<li>
<?php
$session = Mage::getSingleton('customer/session', array('name'=>'frontend'));
if( ($session->isLoggedIn())) {
// Login
?><a href="<?php echo Mage::helper('customer')->getLogoutUrl(); ?>" title="Log out"><?php echo $this->__('Log out') ?></a><?
} else {
// Not Login
?><a href="<?php echo $home_url; ?>customer/account/login/" title="Log out"><?php echo $this->__('Log in') ?></a><?
}
?>
</li>
<li class="searchbox"><span class="action"></span><span class="hidenow"> <?php echo $this->getChildHtml('topSearch') ?></span></li>
<script type="text/javascript">
jQuery( ".searchbox .action" ).click(function() {
jQuery( ".hidenow" ).toggleClass( "activesearch" );
});
</script>
</ul>
</nav>
</div>
</div>
</section>
<section id="promotionalslider">
<?php if(Mage::registry('current_category')){?>
<?php $catdetails = Mage::registry('current_category'); ?>
<div class="categoryblock">
<div class="row">
<div class="fivecol">
<span class="catname"><?php echo $catdetails["name"]; ?></span><p class="catdesc"><?php echo $catdetails["description"]; ?></p>
</div>
</div>
</div>
<?php }else{ ?>
<?php echo $this->getLayout()->createBlock('cms/block')->setBlockId('flexslider')->toHtml() ?><?php echo $this->getLayout()->createBlock('cms/block')->setBlockId('revslider')->toHtml() ?>
<?php } ?>
</section>
<section id="navigatie">
<nav class="primary">
<div class="subcontainer">
<ul>
<?php if ($this->getIsHomePage()):?>
<li class="active"><a href="<?php echo $home_url; ?>"><?php echo $this->__('Home') ?></a></li>
<?php else:?>
<li><a href="<?php echo $home_url; ?>"><?php echo $this->__('Home') ?></a></li>
<?php endif;?>
<?php echo $this->getLayout()->createBlock('cms/block')->setBlockId('primary-navigation-front')->toHtml() ?>
<?php echo $this->getChildHtml('topMenu') ?>
<?php echo $this->getLayout()->createBlock('cms/block')->setBlockId('primary-navigation-back')->toHtml() ?>
</ul>
<div class="cartelement"><?php echo $this->getChildHtml('cart_header'); ?></div>
</div>
</nav>
<div id="mobnav-button">Menu</div>
<ul id="mobnav">
<li><a href="<?php echo $home_url; ?>"><?php echo $this->__('Home') ?></a></li>
<?php echo $this->getLayout()->createBlock('cms/block')->setBlockId('primary-navigation-front')->toHtml() ?>
<?php echo $this->getChildHtml('topMenu') ?>
<?php echo $this->getLayout()->createBlock('cms/block')->setBlockId('primary-navigation-back')->toHtml() ?>
</ul>
<script type="text/javascript">
jQuery(document).ready(function(){
jQuery('#mobnav-button').click(function(){
jQuery('#mobnav').slideToggle(200);
});
var navList = jQuery('#mobnav');
var navOpener = '<span class="open-child">(open)</span>';
navList.find('li:has(ul)',this).each(function() {
jQuery(this).prepend(navOpener);
})
navList.find('.open-child').toggle(function(){
jQuery(this).parent().addClass('over').find('>ul').slideDown(200);
jQuery(this).parent().addClass('over').find('.nav_block>ul').slideDown(200);
},function(){
jQuery(this).parent().removeClass('over').find('>ul').slideUp(200);
jQuery(this).parent().removeClass('over').find('.nav_block>ul').slideUp(200);
});
});
</script>
</section>
<?php echo $this->getChildHtml('topContainer'); ?>
La riga 163 è l'ultima
così a prima vista mi pare che il codice abbia parecchi problemi.
Innanzitutto è probabile che il file sia "troncato" visto che mi pare ci siano parecchi tag aperti non chiusi.
Altra cosa è l'utilizzo costante di funzioni di questo tipo:
$this->getLayout()->createBlock('cms/block')->setBlockId('revslider')->toHtml()
è probabile che lo sviluppatore del tema abbia ignorato gran parte delle pratiche di utilizzo dei layout xml.
Infine attenzione che in alcune parti (tipo intorno alle riga 70-80 il codice php inizia solo con "<?" anzichè con "<?php".
Questo talvolta a seconda della configurazione di apache e di php potrebbe non essere interpretato correttamente.
In ogni caso ti consiglio di cambiare tema 