svn used together with apache ERROR!

Hello all,
I got a problem when I install apache and svn under Windows 2000. I want to
use them together.
The version of Apache is: 2.0.59. The versin of subversion is:1.4.2.
And I add the following to my apache conf file:httpd.conf:

<Location /svn>
DAV svn
SVNListParentPath on
SVNParentPath D:\MyRepo
AuthType Basic
AuthName "Subversion repositories"
AuthUserFile D:\MyRepo\passwd
#AuthzSVNAccessFile svnaccessfile
Require valid-user
</Location>

But when I check out the Repo, I always get the following errer msg:

Error: PROPFIND request failed on '/svn'
Error: PROPFIND of '/svn': 301 Moved Permanently (http://localhost)
I am quite confused about it. PLease help me out.
Thanks a lot for all your help!

-- 
Sincerely,
Computer Science, Ocean University of China
phone: +86 135 5300 3657
email: zzf818@gmail.com
Kelin.