Kolab and horde installation problem

[Pieter Vanmeerbeek]

Hi,

I've reinstalled horde completely. However I still get the same error in
horde.log: 

Could not create object for "DataTree_sql", using fallback "DataTree_null":
DB Error: extension not found [on line 1550 of "/kolab/lib/php/Horde.php"


My horde database in mysql contains a horde_datatree and a
horde_datatree_attributes table as indicated in the
Administration>Setup>Horde>DataTree System menu.

Mail is working, only calendar and contact syncing isn't. Can anyone explain
me what this means or what I've done wrong?

Kind regards,
Pieter
Able


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