Gazebo cturtle Error

roslaunch gazebo_worlds empty_world.launch 
... logging to /home/william/.ros/log/f96de812-7344-11df-9c42-001c4217bafa/roslaunch-arepa-ubuntu-19311.log

started roslaunch server http://arepa-ubuntu:56291/

SUMMARY
========

PARAMETERS
 * /use_sim_time

NODES
  /
    gazebo (gazebo/gazebo)

starting new master (master configured for auto start)
process[master]: started with pid [19325]
ROS_MASTER_URI=http://arepa-ubuntu:11311/

setting /run_id to f96de812-7344-11df-9c42-001c4217bafa
process[rosout-1]: started with pid [19336]
started core service [/rosout]
process[gazebo-2]: started with pid [19339]
Gazebo multi-robot simulator, version 0.10.0

Part of the Player/Stage Project [http://playerstage.sourceforge.net].
Copyright (C) 2003 Nate Koenig, Andrew Howard, and contributors.
Released under the GNU General Public License.

[/opt/ros/cturtle/stacks/simulator_gazebo/gazebo/gazebo-svn/server/GazeboConfig.cc:106]
  Unable to find the file ~/.gazeborc. Using default paths. This may cause OGRE to fail.
directory [/tmp/gazebo-william-0] already exists (previous crash?)
but the owner gazebo server (pid=19000) is not running.
deleting the old information of the directory [/tmp/gazebo-william-0]
Gazebo successfully initialized
terminate called after throwing an instance of 'Ogre::InvalidParametersException'
  what():  OGRE EXCEPTION(2:InvalidParametersException): Could not create gpu programs from render state  in ProgramManager::acquireGpuPrograms at /opt/ros/cturtle/stacks/visualization_common/ogre/build/ogre_src_v1-7-1/Components/RTShaderSystem/src/OgreShaderProgramManager.cpp (line 102)
[gazebo-2] process has died [pid 19339, exit code -6].
log files: /home/william/.ros/log/f96de812-7344-11df-9c42-001c4217bafa/gazebo-2*.log