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gazebo_ros_pkgs is installed, but directory is empty

asked 2018-04-20 04:31:19 -0600

varunvp gravatar image

I was following this vid tutorial on YouTube on controlling joints. . After I typed out the URDF, config and launch files, I ran the roslaunch command from the terminal. I get the following output.

... logging to /home/varun/.ros/log/2244837a-447c-11e8-a7c2-7c67a2be706c/roslaunch-varun-5577-22296.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://varun-5577:46733/


 * /robot_description: <?xml version="1....
 * /rosdistro: indigo
 * /rosversion: 1.11.21
 * /simple_model/ball_joint_position_controller/joint: ball_joint
 * /simple_model/ball_joint_position_controller/pid/d: 0
 * /simple_model/ball_joint_position_controller/pid/i: 0
 * /simple_model/ball_joint_position_controller/pid/p: 1.0
 * /simple_model/ball_joint_position_controller/type: position_controll...
 * /simple_model/joint_state_controller/publish_rate: 20
 * /simple_model/joint_state_controller/type: joint_state_contr...

    controller_spawner (controller_manager/spawner)
    robot_state_publisher (robot_state_publisher/robot_state_publisher)
    urdf_spawner (gazebo_ros/spawn_model)

auto-starting new master
process[master]: started with pid [22308]

setting /run_id to 2244837a-447c-11e8-a7c2-7c67a2be706c
process[rosout-1]: started with pid [22321]
started core service [/rosout]
process[urdf_spawner-2]: started with pid [22329]
process[simple_model/controller_spawner-3]: started with pid [22336]
process[robot_state_publisher-4]: started with pid [22338]
spawn_model script started
[INFO] [WallTime: 1524216058.478740] Loading model xml from ros parameter
[INFO] [WallTime: 1524216058.481209] Waiting for service /gazebo/spawn_urdf_model
[WARN] [WallTime: 1524216088.428033] Controller Spawner couldn't find the expected controller_manager ROS interface.
[simple_model/controller_spawner-3] process has finished cleanly
log file: /home/varun/.ros/log/2244837a-447c-11e8-a7c2-7c67a2be706c/simple_model-controller_spawner-3*.log
^C[robot_state_publisher-4] killing on exit
[urdf_spawner-2] killing on exit

I get this error saying 'Controller Spawner couldn't find the expected controller_manager ROS interface.' Many people who experience this error had forgotten to install gazebo_ros_pkgs, but I had already installed it today. The urdf file searches for a file called, so I thought it would exist inside the gazebo_ros_control folder in gazebo_ros_pkgs. But to my surprise, gazebo_ros_pkgs was empty, except for the existence of a launch.xml file. Repeated attempts to remove and reinstall the packages were in vain, as it would still remain empty. I think the missing contents of this folder are the problem, but I haven't seen any error where it states that is missing. I find this very strange. What could be the problem?

I'm running ROS Indigo, Gazebo 7 on 14.04

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answered 2018-04-20 06:23:20 -0600

gvdhoorn gravatar image

updated 2018-04-20 06:24:22 -0600

Afaik, gazebo_ros_control is not a dependency of gazebo_ros_pkgs, but needs to be installed separately.

After installing that, the library should be located in /opt/ros/$distro/lib.

If you feel this is a problem with the video you watched, then I suggest contacting the author(s) as it would be something that needs to be fixed.

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Asked: 2018-04-20 04:31:19 -0600

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Last updated: Apr 20 '18