Exercise 3.1 unknown service


I am trying to follow exercise 3.1 on services.
It asks to Get information of what type of service message does this /execute_trajectory service uses, as explained in [Example 3.6]

and when I type:
user:~/catkin_ws/src/unit_3_services/launch$ rosservice info /execute_trajectory
I get:
ERROR: unknown service

Any idea?

Hi @valentinasoana,

Have you started the service? This error normally shows when the service is not running.

To start this particular service, you need to run the roslaunch command that moves the robot arm in order to have that working. The command is given in the notebook.