Gtk assertion 'GDK_IS_WINDOW (window)' failed

Using Julia v1.2.0 with Gtk v0.17.0, running Win10 or Mac v10.14.6

A window holding a grid,
holding a notebook,
holding a canvas
generates 5 assertions like:

(:47666): Gdk-CRITICAL **: 11:53:46.732:
gdk_window_get_scale_factor: assertion ‘GDK_IS_WINDOW (window)’ failed

Why? How can I fix it? Do I just have to live with it?

using Gtk

#= build gtk widgets =#
canvas = GtkCanvas()
notebook = GtkNotebook()
push!(notebook, canvas, “my canvas”)

#= layout gtk widgets =#
grid = GtkGrid()
grid[1,1] = notebook

#= create window =#
win = GtkWindow(“my window”)
push!(win, grid)

I’m not sure what’s causing this but in my experience if the application works and doesn’t crash you can ignore those warnings. Maybe there’s something not quite right with the GtkCanvas implementation though (it’s not a normal widget).

In WIN7 a has problem with gtk (Plots) , now a have gksqt.exe in autosart ! Is OK