Re: [Discuss-gnuradio] runtime error while running flowgraph

[CEL]

Have you first registered the "clock" message port? This looks like
you're trying to set a handler for a message port that doesn't exist.

Also, when asking for help, it's usually very helpful to have your
*exact* code somewhere, not a reference to code that is /similar/.

Best regards,
Marcus
On Mon, 2018-08-27 at 04:18 +0000, Rensi Mathew wrote:
> I created a block using gr_modtool add -l python -tsync command,
> where I tried to implement this discussion:[Discuss-gnuradio] Change
> frequency in USRP source automatically (https://lists.gnu.org/archive
> /html/discuss-gnuradio/2016-03/msg00402.html)
> And then used this block in a flowgraph connecting to the block USRP
> Source.
> when I tried to run the top_block.py block, the following error was
> displayed:-
> > address@hidden:/home/pglab1# python top_block.py
> > Traceback (most recent call last):
> > File "top_block.py", line 98, in <module>
> > main()
> > File "top_block.py", line 86, in main
> > tb = top_block_cls()
> > File "top_block.py", line 64, in __init__
> > self.tutorial_frew_sweep_v1_f_0 = tutorial.frew_sweep_v1_f()
> > File "/usr/local/lib/python2.7/dist-
> > packages/tutorial/frew_sweep_v1_f.py", line 40, in __init__
> > self.set_msg_handler(pmt.intern('clock'),self.handler)
> > File "/usr/local/lib/python2.7/dist-
> > packages/gnuradio/gr/gateway.py", line 200, in set_msg_handler
> > self.__gateway.set_msg_handler_feval(which_port, handler)
> > File "/usr/local/lib/python2.7/dist-
> > packages/gnuradio/gr/runtime_swig.py", line 6423, in
> > set_msg_handler_feval
> > return _runtime_swig.block_gateway_sptr_set_msg_handler_feval(self,
> > which_port, msg_handler)
> > RuntimeError: attempt to set_msg_handler_feval() on bad input
> > message port!
> > 
> > Can someone help me to correct this error?
> > Thanking you
> > Rensi Sam
> > Anna University
>  
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> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

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