HI Eileen,
What sort of hardware do you have?    I suspect it might be a problem with
not having sufficient graphics
support<http://www.ros.org/wiki/simulator_gazebo/SystemRequirements>
.<http://www.ros.org/wiki/simulator_gazebo/Tutorials/RunningSimulatorHeadless>
What does 'glxinfo' say?

I've just updated the tutorial to run headless without the need of a
compatible GLX driver, can you give the new instructions a try?

http://www.ros.org/wiki/pr2_simulator/Tutorials/BuildingAMapInSimulation

Thank you.
John


On Mon, Oct 11, 2010 at 11:33 PM, 甄灵 <zhenlin86@gmail.com> wrote:

>
> Dear ros-users:
>
>       I am learning *Building a Map in Simulation* in the website of *
> http://www.ros.org/wiki/pr2_simulator/Tutorials/BuildingAMapInSimulation*.
> When I begin to run the second step "roslaunch pr2_gazebo_wg
> map_building_demo.launch", it gets errors showing in the accessory. And
> the error happened in the last three lines in the error.txt.  What happened?
> Thanks in advanced!
>
> Eileen
> TJ University of Shang Hai
>
>
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