gmr Receive Error

Hi all, I am zia. I successfully installed softwares Uhd_003.006.002/GNU Radio 3.6.5.1/Boost 1.43.1 and gmr on Ubuntu 12.04,but when i run signal capturing command I receive no file at output: //*********************************************************************// zia:~/osmo-gmr/utils/gmr_multi_rx$ sudo ./gmr_multi_rx --gmr1-dl 943 -a RX1 -S A:0 -T 10 --add=usrp2 linux; GNU C++ version 4.6.3; Boost_104601; UHD_003.006.002-rc2 Given gmr1-dl ARFCNs: 943 = 1554.468750 MHz Required bandwidth is: 31.250000 kHz Creating the UHD device... zia~/osmo-gmr/utils/gmr_multi_rx$ //*****************************************************************************// (I am running USRP NI 2930) Any help will be highly appreciated. Thanxs Zia