[horde] failed opening 'log.php' for inclusion

[Nichols, Jonathan]

I'm attempting to get Horde 2.1 up and running. I've followed the
instructions to the best of my abilities but still get this error when
trying to log in from my site:

Warning: Failed opening 'Log.php' for inclusion
(include_path='.:/usr/local/plesk/php/lib/php') in
/usr/local/plesk/apache/vhosts/sique.net/httpdocs/horde/lib/Horde.php on
line 145

Fatal error: Undefined class name 'log' in
/usr/local/plesk/apache/vhosts/sique.net/httpdocs/horde/lib/Horde.php on
line 155


I've looked through the archive and can't turn up anything. Perhaps I'm
overlooking something. Any help would be greatly appredciated. Thanks.