hey , i have figure out this problem i think...in above code u have written
<li class="item"><a href="{$link->getPageLink('sitemap.php', true)}" title="{l s='Sitemap' mod='blockcms'}">{l s='Sitemap' mod='blockcms'}</a></li>
but this section isnt there in blockcms , or if u create it tht will be the stationary page with text writen on it and no linking to other page.
for this u have to write " blockvariouslink " inplace of " blockcms " as sitemap is present there.
it works in mine case , hope u'll get ur problem solved.