You might file a bug report at Gtk.jl. Meanwhile, it looks like the crash is in the notebook (an assertion error in gtk_notebook_buildable_add_child), perhaps try a simpler one that doesn’t use it?
You might file a bug report at Gtk.jl. Meanwhile, it looks like the crash is in the notebook (an assertion error in gtk_notebook_buildable_add_child), perhaps try a simpler one that doesn’t use it?