[Discuss-gnuradio] gr_remez error when running "usrp2_wfm_rcv.py" example

[Jorge Miguel]

After running the USRP2 GNU Radio example "usrp2_wfm_rcv.py" I got an error which I cannot find  the solution in internet, any ideas?
Many thanks in advance.
Jorge.

address@hidden:/usr/share/gnuradio/examples/usrp2$ ./usrp2_wfm_rcv.py 
Using RX d'board 0x0001
gr_remez: band edges must be nondecreasing
Traceback (most recent call last):
  File "./usrp2_wfm_rcv.py", line 284, in <module>
    app = stdgui2.stdapp (wfm_rx_block, "USRP2 WFM RX")
  File "/usr/lib/python2.6/dist-packages/gnuradio/wxgui/stdgui2.py", line 36, in __init__
    wx.App.__init__ (self, redirect=False)
  File "/usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_core.py", line 7978, in __init__
    self._BootstrapApp()
  File "/usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_core.py", line 7552, in _BootstrapApp
    return _core_.PyApp__BootstrapApp(*args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/gnuradio/wxgui/stdgui2.py", line 39, in OnInit
    frame = stdframe (self.top_block_maker, self.title, self._nstatus)
  File "/usr/lib/python2.6/dist-packages/gnuradio/wxgui/stdgui2.py", line 60, in __init__
    self.panel = stdpanel (self, self, top_block_maker)
  File "/usr/lib/python2.6/dist-packages/gnuradio/wxgui/stdgui2.py", line 81, in __init__
    self.top_block = top_block_maker (frame, self, vbox, sys.argv)
  File "./usrp2_wfm_rcv.py", line 97, in __init__
    60)          # stopband attenuation
  File "/usr/lib/python2.6/dist-packages/gnuradio/optfir.py", line 44, in low_pass
    taps = gr.remez (n + nextra_taps, fo, ao, w, "bandpass")
  File "/usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_swig_py_general.py", line 352, in remez
    return _gnuradio_swig_py_general.remez(*args, **kwargs)
RuntimeError: gr_remez: band edges must be nondecreasing