Weird pointer error.

[Leo Przybylski <leo leosandbox org>]

Hello,

I got my GtkNotebook working. I have a new problem now. I have created a 
structure to store the GtkNotebook *, but whenever I try to set the 
pointer with:

GtkWidget * notebook
notebook = gtk_notebook_new();
widget_s->notebook = notebook;

... I get numerous errors:

(console:24261): GLib-GObject-CRITICAL **: file gobject.c: line 1561 
(g_object_ref): assertion `G_IS_OBJECT (object)' failed

(console:24261): Gtk-CRITICAL **: file gtkobject.c: line 459 
(gtk_object_sink): assertion `GTK_IS_OBJECT (object)' failed

(console:24261): GLib-GObject-WARNING **: cannot derive `GtkAdjustment' 
from non-derivable parent type `GtkObject'

(console:24261): GLib-GObject-CRITICAL **: file gobject.c: line 819 
(g_object_new): assertion `G_TYPE_IS_OBJECT (object_type)' failed

(console:24261): GLib-GObject-CRITICAL **: file gobject.c: line 1561 
(g_object_ref): assertion `G_IS_OBJECT (object)' failed

(console:24261): Gtk-CRITICAL **: file gtkobject.c: line 459 
(gtk_object_sink): assertion `GTK_IS_OBJECT (object)' failed

(console:24261): GLib-GObject-WARNING **: cannot derive `GtkAdjustment' 
from non-derivable parent type `GtkObject'

(console:24261): GLib-GObject-CRITICAL **: file gobject.c: line 819 
(g_object_new): assertion `G_TYPE_IS_OBJECT (object_type)' failed


I found that i get the same even when I use:
widget_s->notebook  = 0;

Apparently, somewhere, something is looking for widget_s->notebook and 
maybe there are initialization problems. I'm clueless on this.

This application works better if I don't reinitialize widget_s->notebook 
or when I remove notebook from the widget_s struct.

Any ideas?

Leo