Kadir, <br>Could you post the output of view_frames or tf/tf_monitor.  Based on this post and your last one it suggests that you might have a timing issue between your multiple computers.  Your two computers need to be synchronized, we usually use ntp clients to synchronize our machines.  <br>

<br>Tully<br><br><div class="gmail_quote">On Sat, Feb 5, 2011 at 10:29 AM, kadir <span dir="ltr">&lt;<a href="mailto:kadirfu@gmail.com">kadirfu@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>
Hi Goncalo,<br>
<br>
I did what you have said when I see that error. But /swissranger_link seems<br>
to be connected to the /base_link which is connected to the /odom.<br>
<br>
Any idea?<br>
<br>
-Kadir-<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Tully Foote<br>Systems Engineer<br>Willow Garage, Inc.<br><a href="mailto:tfoote@willowgarage.com">tfoote@willowgarage.com</a><br>(650) 475-2827<br>