Benchmark_ofdm_rx not working

I tried sudo ./benchmark_ofdm_tx.py -f 2412M -v --tx-amplitude=3000 -m
bpsk -T A for the TX which works well.
However while running

sudo ./benchmark_ofdm_rx.py -f 2412M -v --rx-gain=0 -m bpsk -R B
on the same computer, it shows an error
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/blks2impl/ofdm.py”,
line 198, in init
self._bonus = options.bonus

AttributeError: Values instance has no attribute ‘bonus’
what is missing ?