[ros-users] Hokuyo Laserscanner -- Cached parameter is invalid for key [/hokuyo/diagnostic_period]

Eric Perko wisesage5001 at gmail.com
Mon Jun 11 18:54:07 UTC 2012

Hi Christian,

Please ask this on answers.ros.org and reply back here with the link so
that we can find it more easily. ROS Answers is a better forum for this
type of question so that it can be tagged and indexed more easily.

- Eric

On Thu, Jun 7, 2012 at 7:52 AM, Christian Atanas Müller <
christian.mueller at smail.inf.fh-bonn-rhein-sieg.de> wrote:

> Hey everyone,
> I changed from oneric/electric to precise/fuerte and I am using a hokuyo
> laserscanner and a pan-tilt unit to generate via the laser_scan_assembler a
> 3D pointcloud of the scene.
> It has worked fine under oneric/electric. However since I changed to
> precise/fuerte the assembled pointcloud generation does not work anymore.
> The hokuyo node still publishes single laser scans without a problem.
> The begin and end timings of the tilting sequences are sent to the
> laser_scan_assembler node to generate the assembled point cloud. But as a
> result the laser_scan_assembler node returns an empty point cloud.
> After some investigation I found out under rxconsole this message from the
> hokuyo node:
> header:
>  seq: 304666
>  stamp: 1339067745.866227001
>  frame_id:
> level: 1
> name: /hokuyo
> msg: Cached parameter is invalid for key [/hokuyo/diagnostic_period]
> file: /tmp/buildd/ros-fuerte-ros-**comm-1.8.9-0precise-20120510-**
> 0033/clients/cpp/roscpp/src/**libros/param.cpp
> function: param::getImpl
> line: 184
> topics[]
>  topics[0]: /rosout
>  topics[1]: /diagnostics
>  topics[2]: /hokuyo/parameter_descriptions
>  topics[3]: /hokuyo/parameter_updates
>  topics[4]: /hokuyo_scan
> Does anybody knows why "Cached parameter is invalid for key
> [/hokuyo/diagnostic_period]" --  I guess that causes the error.
> Thanks a lot for any help.
> Cheers,
>  Chris
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