[ros-users] Cannot load message class for [rviz/SelectionMessage]. Are your messages built?

[Ken Conley]

As a follow-up, if you're trying to hack rviz by adding new messages to it,
you need to add the messages in a separate package. rviz builds its own
swig-based Python module that prevents the ROS python data classes from
loading. C++ messages will work, but Python will not due to the way Python
defines modules.

 - Ken

On Tue, Jun 8, 2010 at 4:05 PM, Ken Conley <kwc at willowgarage.com> wrote:

> 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 at 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
>> _______________________________________________
>> ros-users mailing list
>> ros-users at code.ros.org
>> https://code.ros.org/mailman/listinfo/ros-users
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ros.org/pipermail/ros-users/attachments/20100608/338e2204/attachment-0003.html>