youBot Kuka Simulation

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Hi there, I'm new about Ubuntu and ROS and I'm approching them for my Master Thesis work. In this way I'm working with the KUKA youBot, I would make a first simulation, and guide the robot in to Gazebo environment. I've followed all the pass of the guide presents in youBot wiki, section Software (Installed Ros Hydro, get the youBot KUKA API and Ros Wrapper and Navigation) but when I write this command :

roslaunch youbot_description youbot_arm_publisher.launch

apper this error:

[youbot_arm_publisher.launch] is neither a launch file in package [youbot_description] nor is [youbot_description] a launch file name

I would be very grateful if you helped me with this problem Thanks