Hi Hao,

I'm not sure what you mean by "rostopic echo *"

Your error message is odd because there is no such message
"rviz/SelectionMessage". It would be helpful if you provided more details.

 - Ken

On Tue, Jun 8, 2010 at 3:54 PM, Hao Dang <dang@cs.columbia.edu> wrote:

> Hello all,
>
> I met a problem when I use "rostopic echo *" on a topic which I built,
> ROS complained and said "Cannot load message class for
> [rviz/SelectionMessage]. Are your messages built?".  But when I wrote
> a dedicated listener which subscribed to this topic, I can get the
> information of the published messages to this topic.  Does anybody
> know why?  By the way, "rostopic list" can list the topic and
> "rostopic info" can also get the information of the topic.
>
> Thank you!
>
> Hao
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