Could not open the lock database – Apache WebDAV setup

I configured a WebDAV server using Apache. Here is my configuration:

DAVLockDB /var/www/DAVLock.db

<Location /majid>
    AllowOverride None
    Options +Indexes
    DAV On
    AuthUserFile /var/www/users.db
    AuthName Authentication
    AuthType Basic
    <Limit GET PUT DELETE PROPFIND PROPPATCH MKCOL COPY MOVE LOCK UNLOCK>
        Require user majid
    </Limit>
</Location>

Alias /majid /var/www/dav/majid

/var/www/DAVLock.db is owned by apache user and group. I can access WebDAV share via browser. I have configured a WebFolder in Windows XP SP3. But I can't create file and folders. error_log file says:

[Tue Oct 11 17:05:12 2011] [error] [client 192.168.1.2] File does not exist: /var/www/dav/majid/New Folder
[Tue Oct 11 17:05:12 2011] [error] [client 192.168.1.2] The locks could not be queried for verification against a possible "If:" header.  [500, #0]
[Tue Oct 11 17:05:12 2011] [error] [client 192.168.1.2] Could not open the lock database.  [500, #400]
[Tue Oct 11 17:05:12 2011] [error] [client 192.168.1.2] (13)Permission denied: Could not open property database.  [500, #1]

Can anyone help?
Another question is: Do we need Options +Indexes for WebDAV clients to list files and folders or it is only for web access using browser?