rTorrent user can't access external programs

rTorrent user can't access external programs

I freshly installed a LightHTTPD server to a seedbox. The seedbox is
running rtorrent+rutorrent with multiuser support. (xmlrpc)
The webui is working, I can download through webui, but some of the
plugins won't work. Here is the log from console:
[08.09.2013 12:13:53] autotools: Plugin will not work. rTorrent user can't
access external program (php).
etc..
etc..
etc..
create: Some functionality will be unavailable. rTorrent user can't access
external program (pgrep).
So,there are a lot of "Can't access external program" error. PHP is
installed, safe mode turned off.
PHP's path:
root@s3rver:/usr/local/lighttpd# which php
/usr/bin/php
The config.php contains:
$pathToExternals = array(
"php" => '/usr/bin/php',
So it looks good.
Thanks, Gabor