that is too solved. in example code existed some xhtml comments. i appended configuration at the end of sofia.conf.xml, remove comments, reloaded xml and then distributor_ctl reload works now!

---------- Forwarded message ----------
From: Sayyed Mohammad Emami Razavi <emamirazavi@gmail.com>
Date: Sun, Jun 9, 2013 at 11:44 PM
Subject: mod_distributor
To: freeswitch-users@lists.freeswitch.org


after installing mod_distributor freeswitch cli gave me:
freeswitch@internal> distributor_ctl reload
-ERR distributor_ctl reload Command not found!