Kalman Filter Course - Package not found

Hello,
I am currently at the Unit 6 of the Kalman Filter Course and I am trying to create the Design 4 launch file.
The laser_scan_matcher package can not be launch.

@ClementHeritier
So that we can help you, please include as much details as possible:

  • Include a full screenshot showing the command you ran and the error message you got.
  • Indicate the exercise or example you are working on.
  • Tell us what is working, and what is not.
  • Tell us what you expected to see, and what you saw instead.

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