Prasad,

Can you attach the output of "rosrun tf view_frames" when you're getting the
error message. That command will generate a PDF of your transform tree that
may give more insight into what's going on.

Hope all is well,

Eitan

On Aug 3, 2010 9:48 PM, "Prasad Dixit" <prasad.dixit@fennecfoxtech.com>
wrote:
>
> Hello Eitan,
>
> I am running an AMCL (diff drive) in which parameters are:
> <param name="odom_frame_id" value="/odom"/>
> <param name="base_frame_id" value="/base_link"/>
> <param name="global_frame_id" value="map"/>
>
> In my global costmap conf:
> global_costmap:
> global_frame: /map
> robot_base_frame: base_link
>
> and in LocalCostMap conf:
> global_frame: odom
> robot_base_frame: base_link
>
> and in odom TransformStamped message settings:
> geometry_msgs::TransformStamped odom_trans;
> odom_trans.header.frame_id = "odom";
> odom_trans.child_frame_id = "base_link";
>
> The link is: /map->/odom->/base_link->/base_laser_link
>
> As i said initially it works nicely but after some period it falls off.
>
> My simulation real time parameter is set to false. If i make it true the
> navigation stack hangs.
> <param name="use_sim_time" value="false"/>
>
> Please let me know if i need to sync. frequency.
>
> - Prasad Dixit
>
>