Unable to create ROS2 node, please check that namespace is valid

[54baizeyu]

Isaac Sim Version

4.5.0

Operating System

Ubuntu 22.04

GPU Information

4090
cuda12.3

Topic Description

Detailed Description

I use isaac sim4.5, follow the tutorial (ROS2 Joint Control: Extension Python Scripting — Isaac Sim Documentation) to import the robot arm and create an Action Graph, but when I click the run button, I get the following error:
2025-03-10 05:56:41 [Error] [omni.graph.core.plugin] /graph/ros2_publish_joint_state: [/graph] Unable to create ROS2 node, please check that namespace is valid
2025-03-10 05:56:41 [Error] [omni.graph.core.plugin] /graph/ros2_subscribe_joint_state: [/graph] Unable to create ROS2 node, please check that namespace is valid

Steps to Reproduce

1. Import robotic arm
2. Follow the tutorial to create an action graph
3. click “play” button

Error Messages

2025-03-10 05:56:41 [Error] [omni.graph.core.plugin] /graph/ros2_publish_joint_state: [/graph] Unable to create ROS2 node, please check that namespace is valid
2025-03-10 05:56:41 [Error] [omni.graph.core.plugin] /graph/ros2_subscribe_joint_state: [/graph] Unable to create ROS2 node, please check that namespace is valid

Screenshots or Videos

[zhengwang]

@54baizeyu Did you add a targetPrim path for the node Articulation Controller?
For the robot /panda, could you please check if you have articulation root (property tab → physics)?

I tried on my end and it works fine.

[le.lay.louis]

Hello, I have the exact same problem following this tutorial, and my target prim has an articulation root, would you have any other idea why it would not work ?

[le.lay.louis]

Hi @zhengwang and @54baizeyu, I just resolved this problem. The ros2 bridge was not working when i used the PIP installation but it works when I use the Workstation install.