Unit 2 Exercise 2.7.1 - Joints are not responding --

[MohamedAliZouari]

Hi guys.
I have the same problem as this

Unit 2 Exercise 2.7.1 - Joints are not responding

When I launched the my_robot.launch.py the first time when going through the exercise, I was able to modify joint1 of the robot. However, when I added the modifications to joint2 in the files for exercise 2.7.1 and ran the launch file again, it launched successfully but did not update the joint values. I just get this message on the terminal: [image] I made sure that the code I copied is similar as in the notebook. Anything I am doing wrong?

Could you please help me the code is good and the colcon build and source are correctly worked , the output is also works fine but after i deleted the old model and launch the new file and publish the two joints i have any movements in the gz sim .

[bayodesegun]

@MohamedAliZouari

the output is also works fine but after i deleted the old model and launch the new file and publish the two joints i have any movements in the gz sim .

I do not understand this part. Could you please clarify?

• What’s the old model?
• What’s the new file?
• What did not happen?
• What happened?