[i18n] Log.php problem

[dimitra deka]

I just have installed horde and imp,and I try to login. But I have the
following error:
"Warning: Failed opening 'Log.php' for inclusion
(include_path='.:/opt/php-4.2.2/lib/php') in
/directory/horde/lib/Horde.php on line 145

Fatal error: Undefined class name 'log' in
/directory/horde/lib/Horde.php on line 155
"

I searched for Log.php and I didn't find it. I searched for
include_path or include but I didn't find anything! could you help
with that? What could that be?