[Discuss-gnuradio] error meaning: not connected internally

[Makmur Hidayat]

Dear all,

I try to make simulation for qam loopback. But there is an error: RuntimeError: hierarchical block 'qam8_demod' input 0 is not connected internally

What is the error mean?

Thank you for your help
Makmur

File "/home/makmur/sim_qam_loopback.py", line 150, in <module>
    tb.Run(True)
  File "/usr/lib/python2.6/dist-packages/grc_gnuradio/wxgui/top_block_gui.py", line 73, in Run
    if start: self.start()
  File "/usr/lib/python2.6/dist-packages/gnuradio/gr/top_block.py", line 97, in start
    self._tb.start()
  File "/usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_swig_py_runtime.py", line 1411, in start
    return _gnuradio_swig_py_runtime.gr_top_block_sptr_start(*args, **kwargs)
RuntimeError: hierarchical block 'qam8_demod' input 0 is not connected internally