Exercise3.4 in service

Course Support ROS Basics In 5 Days (C++)
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Hi @tjdtkadn, welcome to the community!

I think the post below will answer your question, if you are taking the Python course.

However, if you are on the C++ course (as it seems now), then please check that you have…

  • Edited CMakeLists.txt and package.xml as instructed.
  • Compiled using catkin_make.
  • Run source devel/setup.bash on every terminal window, after catkin_making..