Hi Paul,

Thanks very much for your help! I have disabled logging and debug in OFDM
Parse MAC block, but the error is still there.

Did you also see the below error in your case when (gdb) run
wifi_loopback.py?
[image: Inline image 1]
ImportError: No module named 'libstdcxx'


Thanks


On Wed, Aug 12, 2015 at 9:07 PM, Paul Garver <garv...@gatech.edu> wrote:

> Tian,
>
> Disable logging and debug in the GRC flowgraph.  See if this solves the
> problem. For reference, see [1].
>
>
> [1]
> https://lists.gnu.org/archive/html/discuss-gnuradio/2015-07/msg00289.html
>
> On 08/12/2015 01:23 PM, discuss-gnuradio-requ...@gnu.org wrote:
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