change your index.php

<?php
// change the following paths if necessary
$yii = dirname(__FILE__) . 'path/to/yii';
$config = dirname(__FILE__) . '/protected/config/main.php';

// remove the following lines when in production mode
defined('YII_DEBUG') or define('YII_DEBUG', true);
// specify how many levels of call stack should be shown in each log message
defined('YII_TRACE_LEVEL') or define('YII_TRACE_LEVEL', 3);
require_once($yii);
require_once dirname(__FILE__) . 'path/to/ezcomponents/Base/src/base.php';
Yii::registerAutoloader(array('ezcBase', 'autoload'), true);
Yii::createWebApplication($config)->run();
?>