[horde] Please Help!!! 'Horde/String.php' 'Horde/Util.php'

[Bartosz Jozwiak]

Hello I have following problem. But pear is installed so why Horde is saying
me this:

Warning: Failed opening 'Horde/String.php' for inclusion
(include_path='.:/usr/share/pear') in /var/www/horde/lib/core.php on line 37

Warning: Failed opening 'Horde/Util.php' for inclusion
(include_path='.:/usr/share/pear') in /var/www/horde/lib/Horde.php on line 4

Fatal error: Undefined class name 'util' in /var/www/horde/lib/base.php on
line 32