[App_rpt-users] outstreamcmd format

Could someone please fill me in on the proper format for outstreamcmd. I have ezstream installed and functional, feeding an Icecast server. I assume the command goes in the node stanza. I tried outstreamcmd="/usr/bin/ezstream -c /etc/ezstream.xml" but I just get errors ERROR[1434]: app_rpt.c:5318 startoutstream: exec of /usr/bin/ezstream -c /etc/ezstream.xml failed. Any help would be appreciated, Thanks, Steve