When i click on Latest comments Rss i get this message : Warning: require_once(/home/ochiosu/public_html/zenzp_core/folder-definitions.php) [function.require-once]: failed to open stream: No such file or directory in /home/ochiosu/public_html/zen/rss-comments.php on line 2

Fatal error: require_once() [function.require]: Failed opening required '/home/ochiosu/public_html/zenzp_core/folder-definitions.php' (include_path='.:/usr/lib/php') in /home/ochiosu/public_html/zen/rss-comments.php on line 2

What does line 2 of rss-comments.php look like? There appears to be a slash missing, but the versions of that line I reviewed have the slash properly included.

This is the line 2 : require_once(dirname(__FILE__).'zp_core/folder-definitions.php');

i rezolved with these error but now when i acces rss comments it is a blank page http://www.adriandaminescu.com/zen/rss-comments.php

in Firefox i have these message : Zenphoto Error: the requested object was not found.
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First you should consider to update to the official 1.2.6 (you are running 1.2.6 RC1). Second make sure that the file rss-comments.php acutally exists in the root of your Zenphoto installation.

i have made the update to 1.2.6 and the rss-comments.php it is in the root of zenphoto installation!

the rss-comment still not working!

Your link above works perfectly for me.

in firefox yes work but iexplorer says Internet Explorer cannot display this feed

Sorry can't help with IE. Try to enable modrewrite, this generates better XML (feed) safe urls.