cannot register existing type 'GtkWidget'

[Xav12358]

Hello,

I just install the Qt 5.9, previously I used the 5.7. On that line:

QRgb rgb = QColorDialog::getRgba(qRgb(255,255,255),&ok);

I get that error:

(BGE_GUI:3730): GLib-GObject-WARNING **: cannot register existing type 'GtkWidget'

(BGE_GUI:3730): GLib-GObject-WARNING **: cannot add class private field to invalid type '<invalid>'

(BGE_GUI:3730): GLib-GObject-WARNING **: cannot add private field to invalid (non-instantiatable) type '<invalid>'

(BGE_GUI:3730): GLib-GObject-CRITICAL **: g_type_add_interface_static: assertion 'G_TYPE_IS_INSTANTIATABLE (instance_type)' failed

(BGE_GUI:3730): GLib-GObject-WARNING **: cannot register existing type 'GtkBuildable'

(BGE_GUI:3730): GLib-GObject-CRITICAL **: g_type_interface_add_prerequisite: assertion 'G_TYPE_IS_INTERFACE (interface_type)' failed

(BGE_GUI:3730): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(BGE_GUI:3730): GLib-GObject-CRITICAL **: g_type_add_interface_static: assertion 'G_TYPE_IS_INSTANTIATABLE (instance_type)' failed

(BGE_GUI:3730): GLib-GObject-CRITICAL **: g_type_register_static: assertion 'parent_type > 0' failed

(BGE_GUI:3730): GLib-GObject-WARNING **: cannot add private field to invalid (non-instantiatable) type '<invalid>'
Le programme s'est terminé subitement.

I use Xubuntu 16.04.

[jsulm]

@Xav12358 Those are not Qt warnings. Is your app working properly?

[Xav12358]

The QDialog is not show and the MainWindows freeze.

[VRonin]

Gtk + Qt ?!

[Xav12358]

I don't understand too. I just install the new Qt 5.9...

[Vadi2]

It looks like Qt is misusing the GTK+ API when rendering the widgets with a GTK+ style.