Create new world in Gazebo [closed]

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Hello!

I'm trying to create a new world in Gazebo. I followed the instructions explained in this tutorial:

http://www.ros.org/wiki/cob_gazebo_worlds/Tutorials/Create%20your%20own%20world

I followed every step, but when launching the new world I get this response:

process[gazebo-1]: started with pid [2521] 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. /tmp/buildd/ros-electric-simulator-gazebo-1.4.15/debian/ros-electric-simulator-gazebo/opt/ros/electric/stacks/simulator_gazebo/gazebo/build/gazebo/server/rendering/OgreAdaptor.cc:187 : Exception: Ogre TextureManager initialization failed. Please double check your world file or glx support from your gpu / gpu driver, thank you. /tmp/buildd/ros-electric-simulator-gazebo-1.4.15/debian/ros-electric-simulator-gazebo/opt/ros/electric/stacks/simulator_gazebo/gazebo/build/gazebo/server/Simulator.cc:309 : Exception: Failed to Initialize the Rendering engine subsystem /tmp/buildd/ros-electric-simulator-gazebo-1.4.15/debian/ros-electric-simulator-gazebo/opt/ros/electric/stacks/simulator_gazebo/gazebo/build/gazebo/server/rendering/OgreAdaptor.cc:187 : Exception: Ogre TextureManager initialization failed. Please double check your world file or glx support from your gpu / gpu driver, thank you. Error Loading Gazebo /tmp/buildd/ros-electric-simulator-gazebo-1.4.15/debian/ros-electric-simulator-gazebo/opt/ros/electric/stacks/simulator_gazebo/gazebo/build/gazebo/server/Simulator.cc:309 : Exception: Failed to Initialize the Rendering engine subsystem /tmp/buildd/ros-electric-simulator-gazebo-1.4.15/debian/ros-electric-simulator-gazebo/opt/ros/electric/stacks/simulator_gazebo/gazebo/build/gazebo/server/rendering/OgreAdaptor.cc:187 : Exception: Ogre TextureManager initialization failed. Please double check your world file or glx support from your gpu / gpu driver, thank you. [gazebo-1] process has died [pid 2521, exit code 255]. log files: /home/gici/.ros/log/7e67d852-2cac-11e2-88cf-001e4fec0e49/gazebo-1.log all processes on machine have died, roslaunch will exit shutting down processing monitor... ... shutting down processing monitor complete done*

It says that the problem is probably in my ".world" file. I have compared it with some other ".world" files that come with Gazebo, and I can't find the problem. I just did what the tutorial says, putting the name of my ".dae" file in the two lines there specified.

I searched the Internet for help, and found nothing.

Thank you very much for your help!