[Users] use of nathelper!

Hi all I want to use nathelper for nat transversal. But when i make a call, i have this error: 0(11117) ERROR: force_rtp_proxy2: no available proxies 0(11117) ERROR: force_rtp_proxy2: no available proxies 0(11117) ERROR: force_rtp_proxy2: no available proxies 0(11117) ERROR: unforce_rtp_proxy: no available proxies 0(11117) ERROR: force_rtp_proxy2: no available proxies 0(11117) ERROR: unforce_rtp_proxy: no available proxies 0(11117) ERROR: force_rtp_proxy2: no available proxies 0(11117) ERROR: unforce_rtp_proxy: no available proxies 0(11117) ERROR: unforce_rtp_proxy: no available proxies 0(11117) ERROR: unforce_rtp_proxy: no available proxies 0(11117) ERROR: unforce_rtp_proxy: no available proxies 0(11117) ERROR: unforce_rtp_proxy: no available proxies What's matter? does i install a rtp proxy in a host? best regards! Serge