Action client not connected

When launching my demo_gazebo.launch file generated by the MSA after having added the controllers.yaml file I get the error “Action client not connected” After waiting for a while rostopic list does not show any topics related to the controllers as shown in ROS Control 101 Tutorial. Does anybody know what is going on? @staff

Hello @carlos.giese14,

What Course/Unit/Exercise are you talking about here? I’d need this information in order to help you better.