I am trying to use the cturtle binaries on ubuntu to experiment with gazebo's new features. When I run `roslaunch gazebo_worlds empty_world.launch` I get this error: http://gist.github.com/430689 In trying to debug this we have tried to run this on two different macbook pros running ubuntu lucid in parallels and on a laptop running lucid that has an ati x1300 moble all with the same result. Any ideas would be appreciated. Thanks, ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ William Woodall Graduate Software Engineering Auburn University w@auburn.edu wjwwood@gmail.com 256-345-9938 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~