>     return _gnuradio_core_runtime.gr_top_block_sptr_start(self)
> RuntimeError: In hierarchical block cc1k_mod_pkts, input 0 is not connected 
> internally
> 

Well that right there looks like your problem. cc1k_mod_pkts must be a
block with an input, but you didnt connect its input to a data source.

-josh

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