[Discuss-gnuradio] Error creating block with different input signature

[sarankumar]

Hi,
I am trying to create a C++ block with different input signatures in each of the inputs.I tried the following 2 methods.
1) I followed the example in "pfb_clock_sync_ccf" and created the io signature as:

static int ios[] = {sizeof(gr_complex)*8, sizeof(float), sizeof(float), sizeof(float)};
static std::vector<int> iosig(ios, ios+sizeof(ios)/sizeof(int));

beamforming_sum_vcc_impl::beamforming_sum_vcc_impl(int num_channels)
      : gr::sync_block("beamforming_sum_vcc",
              gr::io_signature::makev(1,4, iosig),
              gr::io_signature::make(1, 1, sizeof(gr_complex))),
              N(num_channels)

2) I also tried the method suggested in earlier posts.

static vector<int> get_input_sizes(){
    std::vector<int> input_sizes;
    input_sizes.push_back(sizeof(gr_complex)*8);
    input_sizes.push_back(sizeof(gr_complex));
    input_sizes.push_back(sizeof(gr_complex));
    input_sizes.push_back(sizeof(gr_complex));

    return input_sizes;
    }
beamforming_sum_vcc_impl::beamforming_sum_vcc_impl(int num_channels)
      : gr::sync_block("beamforming_sum_vcc",
              gr::io_signature::makev(1,4,get_input_sizes()),
              gr::io_signature::make(1, 1, sizeof(gr_complex))),
              N(num_channels)

In both the cases I am getting the following error when doing the makexml process.
Any help?

Error: Can't parse input signature.
Traceback (most recent call last):
  File "./gr_modtool", line 47, in <module>
    main()
  File "./gr_modtool", line 39, in main
    modtool.run()
  File "/usr/local/lib/python2.7/dist-packages/gnuradio/modtool/modtool_makexml.py", line 67, in run
    self._make_grc_xml_from_block_data(params, iosig, blockname)
  File "/usr/local/lib/python2.7/dist-packages/gnuradio/modtool/modtool_makexml.py", line 91, in _make_grc_xml_from_block_data
    if iosig[inout]['max_ports'] == '-1':
KeyError: 'in'

thanks,

Saran