Problem in GTK+ box?

[=?big5?q?Kevin=20H=20S=20Cheang?= <win_ppt yahoo com>]

Dear All,

I have type the following, but error occurs.  What is
the reason?
/* cLabel.c*/

#include <gtk/gtk.h>

int main ( int argc, 
	   char *argv[] )
{

GtkWidget *window;
GtkWidget *frame1;
GtkWidget *frame2;
GtkWidget *box;

gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "EDA");

g_signal_connect (G_OBJECT (window), "destroy", 
		  G_CALLBACK (gtk_main_quit), NULL);
gtk_widget_set_size_request (window, 300, 300);
gtk_container_set_border_width (GTK_CONTAINER
(window), 10);

box=gtk_vbox_new(TRUE,0);
gtk_container_add(GTK_CONTAINER(window),box);

frame1=gtk_frame_new (NULL);
gtk_container_add (GTK_CONTAINER (window), frame1);
gtk_frame_set_label (GTK_FRAME (frame1), "GTK Frame
Widget");
gtk_frame_set_label_align (GTK_FRAME (frame1), 1.0,
0.0);
gtk_frame_set_shadow_type (GTK_FRAME (frame1),
GTK_SHADOW_ETCHED_OUT);
gtk_box_pack_start(GTK_BOX(box), frame1, FALSE, FALSE,
0);

frame2=gtk_frame_new (NULL);
gtk_container_add (GTK_CONTAINER (window), frame2);
gtk_frame_set_label (GTK_FRAME (frame2), "GTK Frame
Widget");
gtk_frame_set_label_align (GTK_FRAME (frame2), 1.0,
0.0);
gtk_frame_set_shadow_type (GTK_FRAME (frame2),
GTK_SHADOW_ETCHED_OUT);
gtk_box_pack_start(GTK_BOX(box), frame2, FALSE, FALSE,
0);

gtk_widget_show (frame1); 
gtk_widget_show (frame2);
gtk_widget_show (box);
gtk_widget_show (window);

gtk_main ();
return FALSE;

}

The error is:
(clabel:1197): Gtk-WARNING **: Attempting to add a
widget with type GtkFrame to a GtkWindow, but as a
GtkBin subclass a GtkWindow can only contain one
widget at a time; it already
contains a widget of type GtkVBox
[root localhost clabel]# gedit clabel.c

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