problems validating xhtml

when i try to validate the xhtml

it give-me some errors like this:

..ut.com”>Home<li class=”page_item”>

and when i see the code in the browser it appears this:

<li class=”current_page_item” > Home<li class=”page_item”>

The logical error is a missing

but in the php file the code related to this is:

<li <?php if(is_home()) { echo ‘class=”current_page_item”‘;} ?> > “>Home<?php wp_list_pages(‘sort_column=menu_order&depth=1&title_li=’); ?>

The error must be here.
Could someone help me? I would appreciate you efforts.
Thanks in advance