PHP   Object not found!

电脑老是出现这个问题：
Object not found!

The requested URL was not found on this server. The link on the  referring page seems to be wrong or outdated. Please inform the author of that page about the error.
If you think this is a server error, please contact the  webmaster .
Error 404 
LOCALHOST
07/22/10 10:17:22
Apache/2.2.11 (Win32) DAV/2 mod_ssl/2.2.11 OpenSSL/0.9.8i PHP/5.2.9

请帮忙解决 谢谢！

对象不存在

能说明白点么：
我的代码是：
<form action="  "enctype="multipart/form-data" method="post" name="upform">
上传文件：
<input name="upfile" type="file">
<input type="submit" value="上传"><br>
</form>

怎么没人回答啊