svn add and commit problem ?

Hi,

I have a svn server via http on a apache2 web server. The commit, update 
works fine. The only problem is when I add a file on my working directory.
The commit return the following error :

svn: Commit failed (details follow):
svn: PROPFIND request failed on '/svn/EmploiNet/trunk/Script/toto'
svn: PROPFIND of '/svn/EmploiNet/trunk/Script/toto': 302 Found 
(http://xxxxx)

I think the problem is in my virtual host ?

An idea ? I try to put

<Location /svn>
DAV svn
SVNParentPath /home/www-data/svn/
</Location>
in apache2.conf or in mods-enabled/dav_svn.conf and in site-available 
but always the same result.
I work on the last Debian stable. My DocumentRoot is /home/www-data

Thanks for help. On a web server without virtual host, no problem. We 
svnserve, it's also work fine.