Problem on bbn code

Hi,

I test the bbn code on my USRP, and I run the ./bbn_80211b_test.py, but
there is error as below:

gr_fir_ccf: using SSE
Traceback (most recent call last):
File “./bbn_80211b_test.py”, line 122, in
main()
File “./bbn_80211b_test.py”, line 103, in main
fg = my_graph(rx_callback, options.spb, options.alpha, options.snr)
File “./bbn_80211b_test.py”, line 54, in init
gain=1)
File
“/home/pl506/gnuradio/adroitgrdevel/gr-bbn/src/examples/bbn_80211b_pkt.py”,
line 70, in init
self.xpsk_mod = bbn_80211b.bbn_80211b_mod(fg, *args, **kwargs)
File
“/home/pl506/gnuradio/adroitgrdevel/gr-bbn/src/examples/bbn_80211b.py”,
line 107, in init
gr.hier_block2.init(self, fg, self.scrambler, self.tx_filter)
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/gr/hier_block2.py”,
line 42, in init
self._hb = hier_block2_swig(name, input_signature, output_signature)
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_swig_py_runtime.py”,
line 971, in hier_block2_swig
return _gnuradio_swig_py_runtime.hier_block2_swig(*args, **kwargs)
TypeError: in method ‘hier_block2_swig’, argument 1 of type ‘std::string
const’

It seems that this problem has relation with type, but I do not know.
Does anyone meet the same problem? Thank you very much…

Chen