Can't enable/add camera on Kuka Youbot in Gazebo

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Hi I am pretty new to ROS, Gazebo, and Ubuntu. Now I'm trying to add a camera on the Kuka Youbot Model which I installed from the youbot website: http://www.youbot-store.com/wiki/inde... .

So I'm using the Indigo version of ROS, and I've tried to enable the cameras that came with the package but I couldn't get any of them to appear on the simulation. From what I know, to use one of the camera, you just include the refernce and simulation tag of the camera in the youbot.urdf.xacro file. I tried that but didn't work. I need this for a senior design project, in which i need to simulate lane keeping in the road using cameras. I would appreciate any help from anyone with experience with this. Thanks.