WHY: (gtk_draw_point ) assertion `GDK_IS_DRAWABLE (drawable)' failed ?



is any erro with gdk_draw_point() ? somthing simple
mistake i am  not able to find it? it is giving 
 line 337 (gdk_draw_point): assertion `GDK_IS_DRAWABLE
(drawable)' failed

 main () {
 GtkWidget *window;
 GtkWidget *da;
 GtkWidget *fixed;
 int x = 10; int y = 10;
 gtk_init (&argc, &argv);
 window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
 fixed = gtk_fixed_new ();
 da = gtk_drawing_area_new ();
 gtk_drawing_area_size (GTK_DRAWING_AREA (da), 60,
 60);
  gtk_widget_show (da);
 gtk_container_add (GTK_CONTAINER (fixed), da);
 gdk_draw_point (da->window, da->style->black_gc,
 x,
 y);
 gdk_draw_point (da->window, da->style->black_gc,
 x, y);

gtk_container_add (GTK_CONTAINER(window),fixed);
 gtk_widget_set_size_request (window,500,400);
 gtk_widget_show_all (window);
 gtk_main ();

Ian now also it is failing why?



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