Hello,

I'm experiencing exactly the same with Ubuntu 11.04.

<code>
$rosrun image_view image_view image:=/gscam/image_raw
init done

(<unknown>:29973): GLib-GObject-WARNING **: invalid uninstantiatable type
`(null)' in cast to `GtkWidget'

(<unknown>:29973): GLib-GObject-WARNING **: instance of invalid
non-instantiatable type `(null)'

(<unknown>:29973): GLib-GObject-CRITICAL **: g_signal_connect_data:
assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
</code>

Did any solution pop up since last August? :)

--Bence

2011/8/6 Carlos J. <ubuntuslave@gmail.com>

>
>
> On Fri, Aug 5, 2011 at 6:23 PM, Jack O'Quin <jack.oquin@gmail.com> wrote:
>
>> On Fri, Aug 5, 2011 at 5:13 PM, Carlos J. <ubuntuslave@gmail.com> wrote:
>> > Perhaps, it's only my case, but I'm experiencing problems with
>> > image_pipeline packages, such as image_view and camera_calibration. They
>> > seem related to wxWidgets. These problems occur only under electric. The
>> > same packages seem to work fine under diamondback. I'm just crying out
>> loud
>> > to see if it's not just me who is experiencing this.
>>
>> More information would be helpful.
>
>
>> What system are you running? What packages did you try?
>>
>> I'm using Ubuntu 11.04 and these 2 problems (that I'm aware of) only
> happens only in ROS Electric.
>
> 1) When trying to run "image_view" (with all kind of images...tried
> different Image topics), I get this:
>    $ rosrun image_view image_view image:=/camera/rgb/image_color
>    [rospack] warning: ignoring duplicate "nodelet" tag in export block
>    init done
>    opengl support available
>
>    (<unknown>:15605): GLib-GObject-WARNING **: invalid uninstantiatable
> type `(null)' in cast to `GtkWidget'
>
>    (<unknown>:15605): GLib-GObject-WARNING **: instance of invalid
> non-instantiatable type `(null)'
>
>    (<unknown>:15605): GLib-GObject-CRITICAL **: g_signal_connect_data:
> assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
>
> 2) With "camera_calibration", I get errors as following:
>    $ rosrun camera_calibration cameracalibrator.py BLABLABLAH
>    Traceback (most recent call last):
>      File
> "/opt/ros/electric/stacks/image_pipeline/camera_calibration/nodes/cameracalibrator.py",
> line 50, in <module>
>        import cv2
>    ImportError: /usr/local/lib/python2.7/dist-packages/cv2.so: undefined
> symbol: _ZNK2cv5flann5Index12getAlgorithmEv
>
> What results did you expect? What did you get?
>>
> None of these problems occur when I use (switch back) to diamondback. The
> packages work as expected in diamondback. I have tried both binary and
> from-source packages with the same results.
>
> I hope this could give you an idea of the problem.
>
> Thanks a lot for looking into it!
>
> Carlos
>
>
>
>> --
>>  joq
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>> https://code.ros.org/mailman/listinfo/ros-users
>>
>
>
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