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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?