Cannot use catkin_make in Exercise 4.4

I copied the solution, however, while using the catkin_make,there was something wrong.
How to fix this problem?

Maybe you have trouble in CMakeFile.txt?

Copying the solution does not guarantee that everything will work. The solution is there as a guide, not for copying.

You should carefully follow the notes and ensure that every file has been created as indicated.

Thanks a lot, after checking the full filename ,I solved this problem :grinning: :grinning: :grinning:

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