Icreated a block using gr_modtool add -l python -tsync command, whereI tried to
implement this discussion:[Discuss-gnuradio] Change frequency in USRPsource
automatically(https://lists.gnu.org/archive/html/discuss-gnuradio/2016-03/msg00402.html)
And thenused this block in a flowgraph connecting to the block USRP Source.
when Itried to run the top_block.py block, the following error wasdisplayed:-
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 youRensi SamAnna University
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