Qt platform error on yarpmanager

[lindalastrico]

Hello,
We are using the latest superbuild stable release with yarp 3.8.1 on Ubuntu 22.04.
When launching yarpmanager, we face this warning:
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
Yarpmanager works fine anyway, except when trying to launch a command from the GUI:

While the Yarpmanager GUI reports "command successfully executed on... ", the command is not actually executed and there is the following error in the yarpmanager terminal:

t.qpa.xcb: could not connect to display
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.

It looks like a Qt issue, what do you suggest?
Thank you!

[traversaro]

I am not really familiar with that functionality of the clusterwidget.

Just to understand, are you able to run yarpview in icub15 if you do not pass via the yarpmanager? Does it work if instead of running it via the "Type the command you wish to execute" you run it via as a module as part of a regular application of yarpmanager?

FYI @Nicogene or @randaz81 do you have any idea on this?

[randaz81]

Not familiar with this error. Maybe some apt get install libxcb (or similar) is missing?

Check these as well:

sudo apt-get install qtbase5-dev \
 qtdeclarative5-dev \
 qtmultimedia5-dev \
 qml-module-qtquick2 \
 qml-module-qtquick-window2 \
 qml-module-qtmultimedia \
 qml-module-qtquick-dialogs \
 qml-module-qtquick-controls

[randaz81]

@lindalastrico any update on your issue?

[lindalastrico]

@randaz81 not yet. I haven’t had the chance to access the lab pc to test it again! I will update you on Thursday, thank you!

[lindalastrico]

Hello @randaz81, @traversaro
Here's some very late updates, I apologize.
We are having problems opening yarpview (and all the other GUIs such as the skinManager) from yarpmanager regular applications as well (this is new, but happening on different PCs in the same way).
I confirm that the same commands work fine when launched from a terminal or when launched from a yarpmanager application on the node "localhost". Instead, they are not executed (with the error stated before) when launched on the node specific name (e.g. icub16, icub15, icubsrv and so on).
Could it be a problem with the ssh? The display option in yarpmanager is correctly set, as in the screenshot attached

Thanks!
Linda

[randaz81]

Can you run via manger a non-qt, non-yarp GUI? For example gedit, which should be based on GTK

[lindalastrico]

No! On the terminal it says:
(gedit:3836): Gtk-WARNING **: 18:01:58.624: cannot open display:
@randaz81 if you have any suggestion let me know!

[traversaro]

To debug further the problem, can you try to launch yarprun on the machine that is creating problems manually, instead of launching it via the yarpmanager?