Revision history [back]

Another source of error could be that you are not sourcing correctly your environment.

I needed:

source /opt/ros/kinetic/setup.bash

source ~/catkin_ws/devel/setup.bash

I hope this will help someone

Another As others already said, you need to make active (by clicking on it) the window where you launched

rosrun turtlesim turtle_teleop_key

But also, another source of error could be that you are not sourcing correctly your environment.

Indeed, I needed: needed in the terminals I was using:

source /opt/ros/kinetic/setup.bash

source ~/catkin_ws/devel/setup.bash

I hope this will help someone

As others already said, you need to make active (by clicking on it) the window where you launched

rosrun turtlesim turtle_teleop_keyturtle_teleop_key

 source /opt/ros/kinetic/setup.bash
 

source ~/catkin_ws/devel/setup.bash