require_once:打开流失败:没有这样的文件或目录

我在"PAGE A" 中有此测试代码:

<?php
require_once('../mysite/php/classes/eventManager.php');
$x=new EventManager();
$y=$x->loadNumbers();
?>

"eventManager.php" 在require_once中:

"eventManager.php" has inside a require_once:

<?php
require_once('../includes/dbconn.inc');
class EventManager {...}
?>

我的文件夹结构是这样的:

My folders structure is this:

mysite/php/classes folder and includes folder

如果我在浏览器中测试PAGE A，则会收到:

If i test PAGE A in a browser i receive:

警告:require_once(../includes/dbconn.inc)[function.require-once]:无法打开流:没有此类文件或 行上的C:\ wamp \ www \ mysite \ php \ classes \ eventManager.php中的目录 3

---

致命错误:require_once()[function.require]:在以下位置无法打开所需的'../includes/dbconn.inc'(include_path ='.; C:\ php5 \ pear') 第3行上的C:\ wamp \ www \ mysite \ php \ classes \ eventManager.php

Warning: require_once(../includes/dbconn.inc) [function.require-once]: failed to open stream: No such file or directory in C:\wamp\www\mysite\php\classes\eventManager.php on line 3

---

Fatal error: require_once() [function.require]: Failed opening required '../includes/dbconn.inc' (include_path='.;C:\php5\pear') in C:\wamp\www\mysite\php\classes\eventManager.php on line 3

错误在哪里?

谢谢 卢卡