gdk_draw_point failing?

[manu aradhya <manu_aradhya yahoo co in>]

is any erro with gdk_draw_point() ?
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_container_add (GTK_CONTAINER (fixed), da);
for (x = 10;x <= 50; x++)
gdk_draw_point (da->window, da->style->black_gc, x,
y);
gdk_draw_point (da->window, da->style->black_gc, x,
y);

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

-
> >  assertion `GDK_IS_DRAWABLE (drawable)' failed
> > can anybody tell me whts the problem with the
> > gdk_draw_point ();
> >               thax for ur help.

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