在浏览器里点mainpage.php没问题，但是，用wget就提示500错误
看日志，里面有php错误
[Sun May 12 08:07:17 2013] [error] [client] PHP Warning: DOMDocument::load(): I/O warning : failed to load external entity "/home/bbs/xml/board.xml" in /home/ftpd/bbs/wwwroot/domxml-php4-to-php5.inc.php on line 57
[Sun May 12 08:07:17 2013] [error] [client] PHP Notice: Trying to get property of non-object in /home/ftpd/bbs/wwwroot/domxml-php4-to-php5.inc.php on line 128
[Sun May 12 08:07:17 2013] [error] [client] PHP Fatal error: Call to a member function item() on a non-object in /home/ftpd/bbs/wwwroot/domxml-php4-to-php5.inc.php on line 131
前两个是警告，应该问题不大，但是最后一个是php错误，估计问题就出这里了。
看了domxml-php4-to-php5.inc.php line 131，也没太明白怎么个情况，我的php是5.3.3的版本，有什么特殊之处么？
这个问题应该怎么解决？
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FROM 36.49.10.*