[horde] installation errors ?

[Mehmet Fatih AKBULUT]

hi all,
when i run test.php i got these errors :

Warning:  include_once(Log.php) [function.include-once]: failed to
open stream: No such file or directory in /var/www/horde/lib/Horde.php
on line 3

 Warning:  include_once() [function.include]: Failed opening 'Log.php'
for inclusion (include_path='/var/www/horde/lib:.:/usr/share/php:/usr/share/pear')
in /var/www/horde/lib/Horde.php on line 3
 Notice:  Only variable references should be returned by reference in
/var/www/horde/lib/Horde/Perms.php on line 341
 Notice:  Only variable references should be returned by reference in
/var/www/horde/lib/Horde/Auth.php on line 1168
 Warning:  Cannot modify header information - headers already sent by
(output started at /var/www/horde/lib/Horde.php:3) in
/var/www/horde/index.php on line 51

how can i fix these problems ? by the way, theres is no log.php ?
did i download a non-complete zip file ?
help please.