Pr2 installed but on running roslaunch gazebo_worlds empty_world.launch shows error [closed]

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The error is like below:

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 Connected to gazebo master @ http://localhost:11345
[ INFO] [1352789412.297725118]: waitForService: Service [/gazebo/set_physics_properties] has not been advertised, waiting...
Msg Waiting for master
Msg Connected to gazebo master @ http://localhost:11345
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Exception [WindowManager.cc:103] Unable to create the rendering window


Error [Rendering.cc:37] Failed to load the Rendering engine subsystem
Unable to create the rendering window

Exception [WindowManager.cc:103] Unable to create the rendering window


[ INFO] [1352789412.695169547]: joint trajectory plugin missing <updateRate>, defaults to 0.0 (as fast as possible)
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Error [WindowManager.cc:96]  Unable to create the rendering window
Exception [WindowManager.cc:103] Unable to create the rendering window


Error [Rendering.cc:37] Failed to load the Rendering engine subsystem
Unable to create the rendering window

Exception [WindowManager.cc:103] Unable to create the rendering window


gzclient: /tmp/buildd/ros-fuerte-visualization-common-1.8.4/debian/ros-fuerte-visualization-common/opt/ros/fuerte/stacks/visualization_common/ogre/build/ogre_src_v1-7-3/OgreMain/src/OgreTextureManager.cpp:42: static Ogre::TextureManager& Ogre::TextureManager::getSingleton(): Assertion `ms_Singleton' failed.
/opt/ros/fuerte/stacks/simulator_gazebo/gazebo/scripts/gui: line 2:  8129 Aborted                 `rospack find gazebo`/gazebo/bin/gzclient -g `rospack find gazebo`/lib/libgazebo_ros_paths_plugin.so
[gazebo_gui-3] process has died [pid 8126, exit code 134, cmd /opt/ros/fuerte/stacks/simulator_gazebo/gazebo/scripts/gui __name:=gazebo_gui __log:=/home/arora/.ros/log/5ec16aec-2d5e-11e2-9a7e-0090f5af72d8/gazebo_gui-3.log].
log file: /home/arora/.ros/log/5ec16aec-2d5e-11e2-9a7e-0090f5af72d8/gazebo_gui-3*.log
gzserver: /tmp/buildd/ros-fuerte-visualization-common-1.8.4/debian/ros-fuerte-visualization-common/opt/ros/fuerte/stacks/visualization_common/ogre/build/ogre_src_v1-7-3/OgreMain/src/OgreTextureManager.cpp:42: static Ogre::TextureManager& Ogre::TextureManager::getSingleton(): Assertion `ms_Singleton' failed.
Aborted
[gazebo-2] process has died [pid 8119, exit code 134, cmd /opt/ros/fuerte/stacks/simulator_gazebo/gazebo/scripts/gazebo /opt ...