problem to launch gazebo

edit

Hi , i have Ubuntu 12.04 and i begin to find my empty_world.launch file in my ROS package i found it in : fuerte /stacks / simulator_gazebo / gazebo_worlds / launch / empty_world.launch begin to launch gazebo using this command on the Terminal : $ roslaunch gazebo_worlds empty_world.launch I get back this long reply !! and i don't know what is the problem exactly !! :

... logging to /home/salma/.ros/log/bad9db3a-0b2a-11e2-9b14-00e04c4d0e3f/roslaunch-salma-G31M-S2L-2792.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://salma-G31M-S2L:46927/

SUMMARY
========

PARAMETERS
 * /rosdistro
 * /rosversion
 * /use_sim_time

NODES
  /
    gazebo (gazebo/gazebo)
    gazebo_gui (gazebo/gui)

auto-starting new master
Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in <module 'threading' from '/usr/lib/python2.7/threading.pyc'> ignored
process[master]: started with pid [2808]
ROS_MASTER_URI=http://localhost:11311

setting /run_id to bad9db3a-0b2a-11e2-9b14-00e04c4d0e3f
Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in <module 'threading' from '/usr/lib/python2.7/threading.pyc'> ignored
process[rosout-1]: started with pid [2821]
started core service [/rosout]
Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in <module 'threading' from '/usr/lib/python2.7/threading.pyc'> ignored
process[gazebo-2]: started with pid [2824]
Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in <module 'threading' from '/usr/lib/python2.7/threading.pyc'> ignored
process[gazebo_gui-3]: started with pid [2831]
Gazebo multi-robot simulator, version 1.0.2
Copyright (C) 2011 Nate Koenig, John Hsu, Andrew Howard, and contributors.
Released under the Apache 2 License.
http://gazebosim.org

Gazebo multi-robot simulator, version 1.0.2
Copyright (C) 2011 Nate Koenig, John Hsu, Andrew Howard, and contributors.
Released under the Apache 2 License.
http://gazebosim.org

Msg Waiting for master.Msg Waiting for master[ INFO] [1349028902.956390978]: waitForService: Service [/gazebo/set_physics_properties] has not been advertised, waiting...


Msg Connected to gazebo master @ http://localhost:11345
Msg Connected to gazebo master @ http://localhost:11345
[ INFO] [1349028905.693671950]: joint trajectory plugin missing <updateRate>, defaults to 0.0 (as fast as possible)
[ INFO] [1349028912.404487554, 0.057000000]: waitForService: Service [/gazebo/set_physics_properties] is now available.
[ INFO] [1349028912.760845061, 1.894000000]: Starting to spin physics dynamic reconfigure node...
/opt/ros/fuerte/stacks/simulator_gazebo/gazebo/scripts/gui: line 2:  2834 Segmentation fault      (core dumped) `rospack find gazebo`/gazebo/bin/gzclient -g `rospack find gazebo`/lib/libgazebo_ros_paths_plugin.so
[gazebo_gui-3] process has died [pid 2831, exit code 139, cmd /opt/ros/fuerte/stacks/simulator_gazebo/gazebo/scripts/gui __name:=gazebo_gui __log:=/home/salma/.ros/log/bad9db3a-0b2a-11e2-9b14-00e04c4d0e3f/gazebo_gui-3.log].
log file: /home/salma/.ros/log/bad9db3a-0b2a-11e2-9b14-00e04c4d0e3f/gazebo_gui-3*.log