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i want know why and how to solve it.thank you very much.
As far as I can tell, that is normal output for that tutorial: it has two nodes talker
and listener
. talker
sends out strings of the form hello world N (with N
a positive integer). listener
(which you didn't start I believe), receives those messages and would print I heard: [Hello world N] (with N
a positive integer).
Do you feel something else should happen?