Unable to identify any set of controllers about panda_simulator

[justagist]

I'm not sure what is happening. It looks like the trajectory action server is not running for the arm. Can you tell me the commands you ran before the demo command?
Are you running:

$ roslaunch panda_gazebo panda_world.launch start_moveit:=false
$ roslaunch panda_sim_moveit sim_move_group.launch
$ roslaunch panda_simulator_examples demo_moveit.launch

[Sission]

I did. I believe it is my Ubuntu system problem. Sometimes it works, sometimes it doesn't...

[justagist]

I see... Maybe the action server fails to start in time in your system.
Try starting all tasks separately:

$ roslaunch panda_gazebo panda_world.launch use_custom_action_servers:=false
$ rosrun panda_sim_custom_action_server start_joint_trajectory_server.py # wait for message: "Joint Trajectory Action Server Running."
$ rosrun panda_sim_custom_action_server start_gripper_action_server.py # wait for message: "GripperInterface: Gripper action servers found!"
$ roslaunch panda_sim_moveit sim_move_group.launch
$ roslaunch panda_simulator_examples demo_moveit.launch

If this works, it means you were starting the moveit server before the trajectory servers were online. So you only have to run the 3 commands I shared in my previous comment, but wait till you see the message saying action server running before you start the moveit server.