Error in a simple GTK program

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Hi!

Windows 10 Home 64 bit, CodeBlocks 20.03. Program
#include <gtk/gtk.h>

static void destroy (GtkWidget*, gpointer);
static void color_changed (GtkColorButton*, GtkWidget*);

int main (int argc, char *argv[])
{
  GtkWidget *window, *button, *label, *hbox;

  GdkRGBA rgba;

  gtk_init (&argc, &argv);

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title (GTK_WINDOW (window), "Color Button");
  gtk_container_set_border_width (GTK_CONTAINER (window), 10);

  g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK (destroy),
NULL);

  rgba.alpha = 0.0; rgba.blue = 0.0; rgba.green = 0.0; rgba.red = 0.0;
  button = gtk_color_button_new_with_rgba(&rgba);
  label = gtk_label_new ("Look at my color!");
  gtk_widget_override_color(label, GTK_STATE_NORMAL, &rgba);

  g_signal_connect (G_OBJECT (button), "color_set", G_CALLBACK
(color_changed), (gpointer) label);

  hbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
  gtk_box_pack_start(GTK_BOX (hbox), button, FALSE , TRUE , 5);
  gtk_box_pack_start(GTK_BOX (hbox), label, FALSE , TRUE , 5);

  gtk_container_add (GTK_CONTAINER (window), hbox);

  gtk_widget_show_all (window);

  gtk_main ();
  return 0;
}

static void color_changed (GtkColorButton *button, GtkWidget *label)
{
  GdkRGBA rgba;
  gtk_color_chooser_get_rgba((GtkColorChooser*) button, &rgba);
  gtk_widget_override_color(label, GTK_STATE_NORMAL, &rgba);
}

static void destroy (GtkWidget *window,          gpointer data)
{
  gtk_main_quit ();
}
When I click on the button and start in terminal mode, an error appears
"(cbGtkStudyWin.exe:1644): Gtk-CRITICAL **: gtk_box_reorder_child:
assertion `GTK_IS_WIDGET (child)' failed". I looked through the entire code
several times, but still did not understand, because of which an error
occurs. Please help me figure it out.

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<div dir=3D"ltr">Hi!<div><br></div><div>Windows 10 Home 64 bit, CodeBlocks =
20.03. Program<br></div><div>#include &lt;gtk/gtk.h&gt;<br><br>static void =
destroy (GtkWidget*, gpointer);<br>static void color_changed (GtkColorButto=
n*, GtkWidget*);<br><br>int main (int argc, char *argv[])<br>{<br>=C2=A0 Gt=
kWidget *window, *button, *label, *hbox;<br><br>=C2=A0 GdkRGBA rgba;<br><br=
>=C2=A0 gtk_init (&amp;argc, &amp;argv);<br><br>=C2=A0 window =3D gtk_windo=
w_new (GTK_WINDOW_TOPLEVEL);<br>=C2=A0 gtk_window_set_title (GTK_WINDOW (wi=
ndow), &quot;Color Button&quot;);<br>=C2=A0 gtk_container_set_border_width =
(GTK_CONTAINER (window), 10);<br><br>=C2=A0 g_signal_connect (G_OBJECT (win=
dow), &quot;destroy&quot;, G_CALLBACK (destroy), NULL);<br><br>=C2=A0 rgba.=
alpha =3D 0.0; rgba.blue =3D 0.0; rgba.green =3D 0.0; rgba.red =3D 0.0;<br>=
=C2=A0 button =3D gtk_color_button_new_with_rgba(&amp;rgba);<br>=C2=A0 labe=
l =3D gtk_label_new (&quot;Look at my color!&quot;);<br>=C2=A0 gtk_widget_o=
verride_color(label, GTK_STATE_NORMAL, &amp;rgba);<br><br>=C2=A0 g_signal_c=
onnect (G_OBJECT (button), &quot;color_set&quot;, G_CALLBACK (color_changed=
), (gpointer) label);<br><br>=C2=A0 hbox =3D gtk_box_new (GTK_ORIENTATION_V=
ERTICAL, 5);<br>=C2=A0 gtk_box_pack_start(GTK_BOX (hbox), button, FALSE , T=
RUE , 5);<br>=C2=A0 gtk_box_pack_start(GTK_BOX (hbox), label, FALSE , TRUE =
, 5);<br><br>=C2=A0 gtk_container_add (GTK_CONTAINER (window), hbox);<br><b=
r>=C2=A0 gtk_widget_show_all (window);<br><br>=C2=A0 gtk_main ();<br>=C2=A0=
 return 0;<br>}<br><br>static void color_changed (GtkColorButton *button, G=
tkWidget *label)<br>{<br>=C2=A0 GdkRGBA rgba;<br>=C2=A0 gtk_color_chooser_g=
et_rgba((GtkColorChooser*) button, &amp;rgba);<br>=C2=A0 gtk_widget_overrid=
e_color(label, GTK_STATE_NORMAL, &amp;rgba);<br>}<br><br>static void destro=
y (GtkWidget *window, =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0gpointer data)<br>{=
<br>=C2=A0 gtk_main_quit ();<br>}<br></div><div>When I click on the button =
and start in terminal mode, an error appears &quot;(cbGtkStudyWin.exe:1644)=
: Gtk-CRITICAL **: gtk_box_reorder_child: assertion `GTK_IS_WIDGET (child)&=
#39; failed&quot;.=C2=A0I looked through the entire code several times, but=
 still did not understand, because of which an error occurs. Please help me=
 figure it out.<br></div></div>

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