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Cannot control gazebo model and getting error "Action client not connected"

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I'm trying to move a robot(Yaskawa SIA20) in gazebo simulation with moveit. I made a robot with gripper as follows. ![image description](https://1drv.ms/u/s!AsclJBqWpW2_sDV11E6F8vKkDzpi) As the above picture shows, I tried to control with rviz through moveit. But, the robot didn't move in gazebo. And I realized following error. ``` [ERROR] [1545806649.874672718, 17.175000000]: Action client not connected: /sia20/sia20_joint_controller/follow_joint_controller ``` I think that this error is a hint to solve my problem. Although this error has been asked sometimes in ros-ansers, but, those existing answers could not help me. Please tell what I forget and how to solve this problem. - [whole error message(copy of terminal)](https://github.com/harumo11/sia20/blob/master/error.html) - [launch file](https://github.com/harumo11/sia20/blob/master/sia20_with_gripper_moveit_config/launch/sia20_with_gripper_moveit.launch) - [controllers.yaml](https://github.com/harumo11/sia20/blob/master/sia20_with_gripper_moveit_config/config/controllers.yaml) - [moveit_controller_manager.launch.xml](https://github.com/harumo11/sia20/blob/master/sia20_with_gripper_moveit_config/launch/sia20_moveit_controller_manager.launch.xml) - [controller.yaml](https://github.com/harumo11/sia20/blob/master/sia20_control/config/sia20_with_gripper_control.yaml) - [package repository](https://github.com/harumo11/sia20) - If you need more information, let me know. I'll tell you soon.

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