Turtlebot astra camera does not publish tf

Hello, I have the following urdf file for my astras cameras (sensor_astra1 and sensor_astra2). The problem is that the /robot_state_publisher does not publish the TF of the cameras, so I cannot use them with RtabMap. I have followed the [instructions](http://wiki.ros.org/turtlebot/Tutorials/indigo/Adding%20New%203D%20Sensor) in order to add new sensors to Turtlebot and I have all the required files. I beleive the problem is with the actual urdf of the cameras but I cannot see the error. The file is: Any help is appreaciated! Cheers