Hitesh,<br><br>If you&#39;re trying to run the navigation stack on your own robot, I&#39;d suggest reading the following tutorial first, <a href="http://www.ros.org/wiki/navigation/Tutorials/RobotSetup/">http://www.ros.org/wiki/navigation/Tutorials/RobotSetup/</a>, as it will explain how the pieces of the navigation stack work and how you&#39;ll need to configure your robot.<br>
<br>From the errors you listed, it looks like your robot may not be publishing odometry information to the navigation stack. Also, amcl will not work without a static map... so that&#39;s expected.<br><br>Hopefully, the tutorial will help, feel free to post again if you have other questions,<br>
<br>Eitan<br><br><div class="gmail_quote">On Tue, Apr 13, 2010 at 5:49 AM, hitesh dhiman <span dir="ltr">&lt;<a href="mailto:hitesh.dhiman.1988@gmail.com">hitesh.dhiman.1988@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi all,<div>I&#39;ve been trying to run the navigation stack. However, upon running move_base.launch, i get the following message:</div><div><br></div><div><div>[ WARN] 1271162502.543875000: Costmap2DROS transform timeout. Current time: 1271162502.5438, global_pose stamp: 1271162501.8677, tolerance: 0.3000</div>

<div><br></div><div>I tried changing the tolerance value to 1. move_base.launch starts with the following:</div><div><div>[ INFO] 1271162733.968657000: Subscribed to Topics: laser_scan_sensor</div><div>[ INFO] 1271162734.066727000: MAP SIZE: 199, 199</div>

</div><div><br></div><div>A second later, i start getting these messages:</div><div><br></div><div><div><div>[ WARN] 1271162749.245438000: MessageNotifier [topic=scan, target=/odom /base_laser ]: Dropped 100.00% of messages so far. Please turn the [ros.costmap_2d.message_notifier] rosconsole logger to DEBUG for more information.</div>

</div></div><div><br></div><div>rxconsole gives the following:</div><div>Request for map failed, trying again...  Warn /amcl</div><div>This could be because i&#39;m not using any static map. Even so, move_base is not publishing any messages out.</div>

<div><br></div><div>Any help would be appreciated. I&#39;m not able to figure out where the problem is.</div><br>-- <br>Regards,<br>Hitesh Dhiman<br>Electrical Engineering<br>National University of Singapore<br>
</div>
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