hobbit and procmail

Sorry for my poor english

I use Hobbit 4.1.2p1 on FC4 and works fine; I tried to use
hobbit-mailack but if I send a Re to a message alert, Hobbit doesn't
acknoledge the reply.  

I cannot understand if my problem is with hobbit configuration or with
procmail (ver. 3.22); any help?

 
My .procmailrc is:

SHELL=/bin/sh

HOBBIT=/usr/local/hobbit

DEFAULT=$HOME/mailbox

LOGFILE=$HOME/procmail.log

VERBOSE=yes

:0:$HOME/mailbox.lock

|"$HOBBIT/server/bin/hobbit-mailack \

--env=$HOBBIT/server/etc/hobbitserver.cfg"

 
Procmail.log contains something like this:

procmail: [13686] Mon Feb 20 16:57:36 2006

procmail: Locking "/home/hobbit/mailbox.lock"

procmail: Executing "/usr/local/hobbit/server/bin/hobbit-mailack
--env=/usr/local/hobbit/server/etc/hobbitserver.cfg"

/bin/sh: /usr/local/hobbit/server/bin/hobbit-mailack
--env=/usr/local/hobbit/server/etc/hobbitserver.cfg: No such file or
directory

procmail: Non-zero exitcode (127) from
"/usr/local/hobbit/server/bin/hobbit-mailack
--env=/usr/local/hobbit/server/etc/hobbitserver.cfg"

procmail: Assigning
"LASTFOLDER=/usr/local/hobbit/server/bin/hobbit-mailack
--env=/usr/local/hobbit/server/etc/hobbitserver.cfg"

procmail: Assigning "LASTFOLDER=/home/hobbit/mailbox"

procmail: Opening "/home/hobbit/mailbox"

procmail: Acquiring kernel-lock

procmail: Unlocking "/home/hobbit/mailbox.lock"

procmail: Notified comsat: "hobbit at 1527:/home/hobbit/mailbox"

From user-40c7a6ecb75d@xymon.invalid  Mon Feb 20 16:57:36 2006

 Subject: Hobbit [240636] uschasbc1:procs CRITICAL (RED)

  Folder: /home/hobbit/mailbox
781

 
Damiano Vozza
Azienda Provinciale per i Servizi Sanitari
Servizio Sistemi Informativi
Ospedale S. Chiara
Via Crosina Sartori 6 Trento - Italy
tel. (+39) 0461364856
fax. (+39) 0461903593
e-mail user-b645b43234db@xymon.invalid <mailto:user-b645b43234db@xymon.invalid> 
web site www.apss.tn.it <http://www.apss.tn.it/>;