Openmanipulator-x gazebo gripper problem

I’m trying to use openmanipulator in gazebo.
However, even if you click actuator enable in the GUI program, the disabled state continues without any change.
Additionally, there is a problem where the gripper moves back and forth left and right during the gripper opening operation and is not fixed. There is very slight vibration when the gripper closes.

What I ran in the terminal window is as follows:
$ roslaunch open_manipulator_gazebo open_manipulator_gazebo.launch
$ roslaunch open_manipulator_controller open_manipulator_controller.launch use_platform:=false
$ roslaunch open_manipulator_control_gui open_manipulator_control_gui.launch

I am attaching the video in question.