[kronolith] Pls help with error

[A Kong]

Dear All,

Pls help on getting kronolith to work.
The following messages were observed in the logs:

horde.log:

Jan 07 11:24:40 HORDE [emergency] [kronolith] '' is not configured in 
the Horde Registry. [on line 753 of "/local/WWW/horde/lib/Registry.php"]

Screen displayed when clicking on "calender' in mail 
(/horde/kronolith/month.php):

A fatal error has occurred:

'' is not configured in the Horde Registry.

[line 753 of /local/WWW/horde/lib/Registry.php]

Details have been logged for the administrator.

Horde versions:
    * horde-2.2.4
    * imp-3.2.2
    * kronolith-1.1
    * php-4.3.3
    * PEAR : - Date version 1.4
    * mysql 4.0.15

Thank you.

Regards
Alan