unused args [ns] for include of /src/aruco_detector/launch/mono_aruco_detector.launch

[zzt007]

Hi there,
I have done all the works follow the readme. But when I tried to launch :

• roslaunch turtlebot_gazebo mobile_robot.launch
  the error in the terminal belike👇
  

I have tried to change the args by myself, I changed [ns] to [sensor], but it caused more errors.
it bothers me a few days, looking forward to your reply.