[Discuss-gnuradio] asking help about gr-ieee802.11

hi. I am newbie of gnuradio.i try run wifi_loopback.grc, all the port
are connected.but when i run it comes out with this messege below:


Generating: "/home/user/gr-ieee802-11/examples/wifi_loopback.py"
>>> Warning: This flow graph may not have flow control: no audio or RF hardware
blocks found. Add a Misc->Throttle block to your flow graph to avoid CPU
congestion.

Executing: "/home/user/gr-ieee802-11/examples/wifi_loopback.py"

linux; GNU C++ version 4.8.2; Boost_105400;
UHD_003.009.git-171-g51bc00ee

Using Volk machine: avx_64_mmx_orc
OFDM MAPPER: encoding: 0
set_min_output_buffer on block 31 to 96000
set_min_output_buffer on block 33 to 96000
set_min_output_buffer on block 35 to 96000
set_min_output_buffer on block 36 to 96000
set_min_output_buffer on block 39 to 96000
set_min_output_buffer on block 50 to 96000

>>> Done (return code -11)


below is my system info:
user@userr-X455LDB:~$ python -V
Python 2.7.6
user@userr-X455LDB:~$ gnuradio-config-info -v
3.7.7.1
user@userr-X455LDB:~$ uname -a
Linux userr-X455LDB 3.13.0-53-generic #89-Ubuntu SMP Wed May 20 10:34:39
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
user@userr-X455LDB:~$ gcc --version
gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.

user@userr-X455LDB:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.2 LTS"

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