[ns] Error while doing "make" in ns

Hello, When I do "make ns" I get the following error trace/cmu-trace.o: In function `hdr_swarm::access(Packet const*)': cmu-trace.cc:(.text._ZN9hdr_swarm6accessEPK6Packet[hdr_swarm::access(Packet const*)]+0x7): undefined reference to `hdr_swarm::offset_' collect2: ld returned 1 exit status mak

[ns] Dropped packets in BS WIMAX - Nw QWI

Dear all, I have this dropped packet in trace file: d -t 10.805844200 -Hs 2 -Hd 4194306 -Ni 2 -Nx 1100.00 -Ny 1000.00 -Nz 0.00 -Ne -1.00 -Nl MAC -Nw QWI -Ma 0 -Md 0 -Ms 8 -Mt 0 -Is 0.0 -Id 4194306.0 -It cbr -Il 5120 -If 0 -Ii 457 -Iv 29 -Pn cbr -Pi 76 -Pf 0 -Po 0 the reason is Nw QWI .