ok Ihave solved last problem but here is another problem net.ipv4.ip_forward = 1...
my system is ubuntu 16.0 and gnuradio 3.7 UHD is 3.9.2 with usrp N210
~~~ Install the project... -- Install configuration: "Release" -- Installing: /usr/local/lib/libLTE_fdd_dl_fg.so...