problems of gazebo's installing and starting

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some problems occur when I am installing and starting gazebo .I am appreciated to you if you can help me !It displays below:

**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] [1362624187.585240917]: joint trajectory plugin missing <updateRate>, defaults to 0.0 (as fast as possible)
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**