留言板在本地测试 的时候是没问题的，上传到空间后，显示留言那部分就出现了错误
Warning: simplexml_load_file() [function.simplexml-load-file]: I/O warning : failed to load external entity "guestbook.xml" in E:\www\14598\3.php on line 4Notice: Trying to get property of non-object in E:\www\14598\3.php on line 5Warning: Invalid argument supplied for foreach() in E:\www\14598\3.php on line 5请问是什么问题呢？该怎么修改？
3.php这行就是$guestbook=simplexml_load_file('guestbook.xml');和下面行
foreach($guestbook->thread as $th)