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:- > > root@pglab1-HCL-Desktop:/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 > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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