When I run:

gazebo /usr/lib/python2.6/site-packages/pyrobot/plugins/worlds/Gazebo/avatarheli.world

I get the following error:

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.

gazebo: OgreTextureManager.cpp:43: static Ogre::TextureManager& Ogre::TextureManager::getSingleton(): Assertion `ms_Singleton' failed.

How can I fix it?

Thanks in advance.