HI Eileen,<br>What sort of hardware do you have?    I suspect it might be a problem with not having <a href="http://www.ros.org/wiki/simulator_gazebo/SystemRequirements">sufficient graphics support</a>.<a href="http://www.ros.org/wiki/simulator_gazebo/Tutorials/RunningSimulatorHeadless"></a>  What does &#39;glxinfo&#39; say?<br>

<br>I&#39;ve just updated the tutorial to run headless without the need of a compatible GLX driver, can you give the new instructions a try?<br><br><a href="http://www.ros.org/wiki/pr2_simulator/Tutorials/BuildingAMapInSimulation">http://www.ros.org/wiki/pr2_simulator/Tutorials/BuildingAMapInSimulation</a><br>

<br>Thank you.<br>John<br><br><br><div class="gmail_quote">On Mon, Oct 11, 2010 at 11:33 PM, 甄灵 <span dir="ltr">&lt;<a href="mailto:zhenlin86@gmail.com" target="_blank">zhenlin86@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">


<br clear="all">Dear ros-users:<br><br>      I am learning <b><i>Building a Map in Simulation</i></b> in the website of <u><i><a href="http://www.ros.org/wiki/pr2_simulator/Tutorials/BuildingAMapInSimulation" target="_blank">http://www.ros.org/wiki/pr2_simulator/Tutorials/BuildingAMapInSimulation</a></i></u>. When I begin to run the second step &quot;<span style="background-color: rgb(255, 255, 102);">roslaunch pr2_gazebo_wg map_building_demo.launch</span>&quot;, it gets errors showing in the <span lang="en"><span title="">accessory. And the error happened in the last three lines in the error.txt.  What happened? Thanks in advanced!<br>



<br></span></span>Eileen<br>TJ University of Shang Hai<br><br>
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