Warning from GTK

Hi all,
I am running KNIME 3.7.0 on CentOS 7.0 and keep on getting following warning from GTK

(KNIME:12075): Gtk-CRITICAL **: gtk_box_gadget_distribute: assertion ‘size >= 0’ failed in GtkScrollbar

It is nothing serious but it is annoying and here already discussed

I wonder whether it might proper of CentOS or it is something which could be eventually corrected.
Best regards

Hi @agiani99,

I am getting the same error on Ubuntu 18.04:
(KNIME:28232): Gtk-CRITICAL **: 15:00:01.375: gtk_box_gadget_distribute: assertion 'size >= 0' failed in GtkScrollbar
and also another warning:
(KNIME:28232): Gtk-WARNING **: 15:00:01.706: Negative content width -1 (allocation 1, extents 1x1) while allocating gadget (node trough, owner GtkProgressBar)

So I guess it is not only CentOS. Looking forward to having this issue resolved.
Best regards,


I’m also getting this on Ubuntu 18.04.

same error on ubuntu 20. Is there any work arround to fix it?

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Confirm @gbottari: same error on Ubuntu Focal 20.4
Is the Knime community at all engaged with Linux???

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I am also seeing this error cluttering the terminal on Ubuntu 20.04.

Any help would be really appreciated.

Also with Centos 7 with KNIME 4.7
Any solutions ???


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The same applies to me, with Knime 4.7 and Ubuntu 22.04.

If I well understood, it seems the bug is between GTK and Eclipse… Have a look on this quite old and still opened issue : GTK 3.22 scrollbar errors when resizing GtkTextView in a GtkScrolledWindow (#210) · Issues · GNOME / gtk · GitLab

I can only advise patience (or lot of motivation and solid skills in Java, GTK and C).