Turba error (Notification.php?)

[Mimmus]

I downloaded latest CVS of Turba address manager and installed it under a
working Horde-2.0/IMP-3.0 environment.

Clicking on 'Addressbook' buttn in IMP I got:

Fatal error: Failed opening required
'/var/www/html/horde/turba/lib/../../lib/Notification.php'
(include_path='.:/php/includes:/usr/share/php') in
/var/www/html/horde/turba/lib/base.php on line 60

There is no Notification.php in my directory tree.

Where is the problem?

Domenico Viggiani