Exception [RenderEngine.cc:468] unable to find rendering system [closed]

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I've installed Gazebo on Ubuntu 12.04, following the instructions re setup.bash and all.

Now, when I enter gzserver I get the following output:

Gazebo multi-robot simulator, version 1.0.1
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
Exception [RenderEngine.cc:468] unable to find rendering system

Error [Rendering.cc:37] Failed to load the Rendering engine subsystem
unable to find rendering system
Exception [RenderEngine.cc:468] unable to find rendering system

Exception [Sensors.cc:39] Unable to load the rendering engine

terminate called after throwing an instance of 'gazebo::common::Exception'

Any help would be greatly appreciated.

Thanks