That code is these lines. It looks like you are missing a phrase for some reason.
Code:
<if condition="$show['member']">
<td class="navitem"><a href="search.php?$session[sessionurl]do=getnew" accesskey="2">$vbphrase[new_posts_nav]</a></td>
<else />
<td class="navitem"><a href="search.php?$session[sessionurl]do=getdaily" accesskey="2">$vbphrase[todays_posts]</a></td>
</if>