Problem controllers - Manipulator arm (ROS noetic)

Course Support URDF for Robot Modeling
1

I created a robot arm standing upright.
When I run the gazebo everything is normal but when I try to move one of the controllers all the arms fall down and I can’t move them anymore. When I run rosservice call list_controller I get an error.

user:~$ rosservice call /mira/controller_manager/list_controller

ERROR: Service [/mira/controller_manager/list_controller] is not available.

I am just getting started and I noticed that when the PID values are close to 1, the arms drop right after starting the simulation, and when these values are increased, I am dealing with the problem given in the title.
Thank you in advance for your help

2

Hi @befard

Welcome to the Community!

Could you please let us know the course and the unit you are taking?

3

Hello

In the URDF for Robot Modeling course, after completing the tutorial based on the Mira robot, I modified the my_mira_description package to create a robot arm, I thought that if I expand it and stick to the instructions on how to create a Mira robot, everything should work