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Traceback (most recent call last):
  File "/usr/local/bin/grgsm_scanner", line 434, in <module>
    main()
  File "/usr/local/bin/grgsm_scanner", line 431, in main
    options.ppm, options.gain, options.args, prn = printfunc, debug = options.debug)
  File "/usr/local/bin/grgsm_scanner", line 329, in do_scan
    ppm=ppm, gain=gain, args=args)
  File "/usr/local/bin/grgsm_scanner", line 238, in __init__
    self.wideband_receiver = wideband_receiver(OSR=4, fc=carrier_frequency, samp_rate=sample_rate)
  File "/usr/local/bin/grgsm_scanner", line 142, in __init__
    self.message_port_register_hier_out("bursts")
  File "/usr/local/lib/python2.7/dist-packages/grgsm/hier_block.py", line 38, in message_port_register_hier_out
    super(hier_block, self).message_port_register_hier_out(port_id)
  File "/usr/lib/python2.7/dist-packages/gnuradio/gr/hier_block2.py", line 152, in message_port_register_hier_out
    self.primitive_message_port_register_hier_out(pmt.intern(portname))
AttributeError: 'module' object has no attribute 'intern'