[Discuss-gnuradio] band pass filter

hello every one ..

               i implement the following spectrum  generation stimulation but band pass parameter show error . 

  File "/home/mahesh/Documents/3110/1/top_block.py", line 128, in __init__
    1, samp_rate, 830000000, 840000000, 10000, firdes.WIN_HAMMING, 6.76))
  File "/usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_general.py", line 9544, in band_pass
    return _gnuradio_core_general.firdes_band_pass(*args, **kwargs)
RuntimeError: gr_firdes check failed: 0 < fa <= sampling_freq / 2

guude me if any buddy face sane problem

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Thanks and regard:

MR.Maheshkumar Pandit

call @ 9662784649