[Discuss-gnuradio] How to add a new block

[Bala V.]

address@hidden:~/gr-howto$ gr_modtool makexml square_ff
GNU Radio module name identified: howto
Warning: This is an experimental feature. Don't expect any magic.
Searching for matching files in lib/:
Making GRC bindings for lib/square_ff_impl.cc...
Traceback (most recent call last):
  File "/usr/local/bin/gr_modtool", line 47, in <module>
    main()
  File "/usr/local/bin/gr_modtool", line 39, in main
    modtool.run()
  File
"/usr/local/lib/python2.7/dist-packages/gnuradio/modtool/modtool_makexml.py",
line 66, in run
    (params, iosig, blockname) = self._parse_cc_h(f)
  File
"/usr/local/lib/python2.7/dist-packages/gnuradio/modtool/modtool_makexml.py",
line 165, in _parse_cc_h
    return (parser.read_params(), parser.read_io_signature(), blockname)
  File
"/usr/local/lib/python2.7/dist-packages/gnuradio/modtool/parser_cc_block.py",
line 81, in read_io_signature
    iosig['in'] =
_figure_out_iotype_and_vlen(iosig_match.group('incall'),
AttributeError: 'NoneType' object has no attribute 'group'

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