[horde] problem with Datatree_Root

[marcel]

Hi,

ive installed horde and most of it is working.

only thinh is that Ansel and tear are giving me the following error :

Notice: Use of undefined constant DATATREE_ROOT - assumed 'DATATREE_ROOT' in 
/var/www/localhost/htdocs/horde/ansel/list.php on line 29

(tear in a different file offcourse)

i;ve search the mailing list and docs, but cant find a sollution.

any idea's