Gazebo: Could not load controller, JointTrajectoryController does not exist

[hilinxinhui]

完成机械臂配置，编译工作空间，运行机械臂仿真：

roslaunch mobot_urdf marm.launch                                                                                  

提示以下错误信息：

[ERROR] [1644327449.899956212, 0.295000000]: Could not load controller 'gripper_controller' because controller type 'position_controllers/JointTrajectoryController' does not exist.
[ERROR] [1644327449.899986526, 0.295000000]: Use 'rosservice call controller_manager/list_controller_types' to get the available types

解决方案见这里，安装时注意包名中的ROS版本字段。