Hello everybody! I'm new to ros and I've just installed the turtlebot package, but I have a problem: when I i launch the file I have :

Msg Connected to gazebo master 127.0.0.1:11345 Msg Publicized address: 192.168.1.131 Dbg Plugin model name: mobilebase [ INFO] [1396868173.295300708, 0.610000000]: Will publish tf. [mobilebase] loaded left cliff sensor <----I used a printf to debug

[ERROR] [1396868173.298741941, 0.610000000]: Couldn't find the name of frontal cliff sensor in the model description! Did you specify it? [mobilebase] [ INFO] [1396868173.300225259, 0.620000000]: Physics dynamic reconfigure ready. [spawnturtlebotmodel-4] process has finished cleanly log file: /home/alessandro/.ros/log/3656e75e-be43-11e3-8635-c860007885c1/spawnturtlebot_model-4*.log

Segmentation fault (core dumped) [gazebogui-3] process has died [pid 14178, exit code 139, cmd /opt/ros/hydro/lib/gazeboros/gzclient _name:=gazebogui _log:=/home/alessandro/.ros/log/3656e75e-be43-11e3-8635-c860007885c1/gazebogui-3.log]. log file: /home/alessandro/.ros/log/3656e75e-be43-11e3-8635-c860007885c1/gazebo_gui-3*.log

It seems to be a problem in loading the frontal cliff sensor. Any solution? I use ROS hydro on ubuntu 12.04 lts with gazebo 1.9.5