Massive problems with mod_dav

[Marcel Thoms <news_(_at_)_silentstagnation_(_dot_)_com>]

Hey Group,

I hope this is the right group but I hope someone here could help 
because I'm getting mad because of this problem!

I installed mod_dav and all went fine my system consists of OpenBSD 3.4, 
Apache 1.3.28 (chrooted) and mod_dav 1.0.3

I want to use my Mozilla Calender through webdav which is possible but
everytime I submit an entry the calender on the server isn't
written and the error_log of apache says:

[Tue Apr 20 10:11:52 2004] [error] [client 80.139.147.111] The locks
could not be queried for verification against a possible "If:" header.
[500, #0]
[Tue Apr 20 10:11:52 2004] [error] [client 80.139.147.111] Could not
open the lock database. [500, #400]
[Tue Apr 20 10:11:52 2004] [error] [client 80.139.147.111] (2)No such
file or directory: I/O error occurred. [500, #1]
[Tue Apr 20 10:21:10 2004] [error] [client 80.139.147.111] File does not
exist: /htdocs/default/favicon.ico

###here are my httpd.conf entries for webdav###
LoadModule dav_module /usr/lib/apache/modules/libdav.so

DAVLockDB /var/www/DAV/DAVLockDB
DAVMinTimeout 600

...
<Directory /var/www/htdocs/default/cal>
DAV On
</Directory>
###end###

I even made chmod 777 for /var/www/DAV so that the apache user www has 
full access but it didn't help and the command:
ls -al /var/www/DAV

returns:
total 8
drwxrwxrwx 2 www www 512 Apr 20 09:32 ./
drwxr-xr-x 9 root daemon 512 Apr 20 09:32 ../

So it seems that those DAVLockDB files acan't be created. On the other 
hand webdav itself seems to work because when I browse the cal-directory 
with DAVExplorer it's recognized as "webdav-able" whereat I don't have 
write access.

Thanks for any help, Marcel