RLException: unused args [topic] for include of [/home/user/catkin_ws/src/ds4_driver/launch/ds4_twist.launch]

[darld]

when running roslaunch headlessrobaka.launch have errror RLException: unused args [topic] for include of [/home/user/catkin_ws/src/ds4_driver/launch/ds4_twist.launch] I remove this in the headlessrobaka.launch, then launch successfully. What is the usage of

[SerdarAbali]

"what is the usage of"

It's the ps4 controller driver that's mentioned in the bottom of the instructions:

2020-03-26 Added teleop with PS4 controller, using the [driver](http://wiki.ros.org/ds4_driver) from Naoki Mizuno

Just go ahead and follow the install instructions on ds4_driver pages, alternatively just remove it from the launch file and use teleop_twist_keyboard to move your robot around.

Regards,

Serdar