The last joint can not be controlled

[zy871125746]

Hello, I have cloned this repository and run it on unity2018.2.2f1. Then I found that 0th~4th joints can be controlled by the slide bar but 5th seems not working. Do you have any idea how this happen?

[shllybkwrm]

The last control is for the end effector. You won't see any reaction without a gripper attached to the robot.