[ns] error make re-compiling after make clean

[Batbold Toiruul]

hi guys,
I made following command for debugging.

./configure --enable-debug
make clean
make

however, i got the error during make procedure.

error:
/diffserv -I./satellite -I./wpan -o trace/trace.o trace/trace.cc
trace/trace.cc: In member function `virtual void DequeTrace::recv(Packet*,
   Handler*)':
trace/trace.cc:567: warning: int format, nsaddr_t arg (arg 5)
trace/trace.cc:567: warning: int format, nsaddr_t arg (arg 6)
trace/trace.cc:567: warning: int format, nsaddr_t arg (arg 5)
trace/trace.cc:567: warning: int format, nsaddr_t arg (arg 6)
trace/trace.cc:586: warning: int format, nsaddr_t arg (arg 5)
trace/trace.cc:586: warning: int format, nsaddr_t arg (arg 6)
trace/trace.cc:586: warning: int format, nsaddr_t arg (arg 5)
trace/trace.cc:586: warning: int format, nsaddr_t arg (arg 6)
make: *** [trace/trace.o] Error 1

bbold at home-2348a775f9 ~/ns-allinone-2.33/ns-2.33
$

can anyone tell me about this error, please?