Set the include path for the ajax server.

ajax_server.php

 <?php
+set_include_path('.'.PATH_SEPARATOR.dirname(__FILE__).'/pear/php');
 if (isset($_GET['client']) && $_GET['client']=='all') {
     include 'ajax_client.js';
 } elseif (isset($_GET['stub']) && $_GET['stub']=='Voting_System') {