Hello,
While working on exercise 5.1, I am taking the error below. I checked the solution and I did what it said but the errors isn’t solved
user:~/catkin_ws/src/unit_5_services$ roslaunch unit_5_services my_robot_arm.launch
RLException: [my_robot_arm.launch] is neither a launch file in package [unit_5_services] nor is [unit_5_services] a launch file name
The traceback for the exception was written to the log file