"./bin/simple_navigation_goals" does not work

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Hello everyone,

I am practising this tutorial:

http://wiki.ros.org/navigation/Tutori...

In its last parts, when i did:

./bin/simple_navigation_goals

I didn't get nothing but as follows:

bash: ./bin/simple_navigation_goals: There is not this file or directory.

Then I serched this file" simple_navigation_goals" in my disk, i found it just exists at melodic/share,and melodic/lib.

It doesn't in /bin directory.

Is this the reason it doesn't work?

Could you do me a favor?

Thank you.