gtk+ g++ error: invalid use of member

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#include <glib.h>
#include <gtk/gtk.h>
#include <iostream>
using namespace std;
#ifndef CONNECT4MENU_H
#define CONNECT4MENU_H


static gboolean deleteEvent( GtkWidget *widget, GdkEvent *event, gpointer data);
static int startGame(GtkWidget *widget, GdkEvent *event, gpointer data);
static int gui();

GtkWidget *window;
GtkWidget *button;
GtkWidget *button2;
GtkWidget *button3;
GtkWidget *button4;
GtkWidget *button5;
GtkWidget *button6;
GtkWidget *box1;
GtkWidget *box2;
GtkWidget *box3;
GtkWidget *box4;
GtkWidget *box5;
GtkWidget *box6;
GSList    *group;
GSList    *group2;
int gamet = 0;

static int gui()
{

	window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

	g_signal_connect(G_OBJECT(window), "delete_event", G_CALLBACK(deleteEvent), NULL);

	box3 = gtk_vbox_new(FALSE, 0);
	gtk_container_add(GTK_CONTAINER(window), box3);
	gtk_widget_show(box3);

	box1 = gtk_hbox_new(FALSE, 0);
	gtk_container_add(GTK_CONTAINER(box3), box1);
	gtk_widget_show(box1);

	button = gtk_radio_button_new_with_label(NULL, "1 Player");
	gtk_box_pack_start(GTK_BOX(box1), button, TRUE, TRUE, 0);
	gtk_widget_show(button);

	group = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));

	button2 = gtk_radio_button_new_with_label(group, "2 Player");
	gtk_box_pack_start(GTK_BOX(box1), button2, TRUE, TRUE, 0);
	gtk_widget_show(button2);

	box4 = gtk_vbox_new(FALSE, 0);
	gtk_container_add(GTK_CONTAINER(box3), box4);
	gtk_widget_show(box4);

	box2 = gtk_hbox_new(FALSE, 0);
	gtk_container_add(GTK_CONTAINER(box4), box2);
	gtk_widget_show(box2);

	button3 = gtk_radio_button_new_with_label(NULL, "Easy");
	gtk_box_pack_start(GTK_BOX(box2), button3, TRUE, TRUE, 0);
	gtk_widget_show(button3);

	group2 = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button3));

	button4 = gtk_radio_button_new_with_label(group2, "Medium");
	gtk_box_pack_start(GTK_BOX(box2), button4, TRUE, TRUE, 0);
	gtk_widget_show(button4);

	group2 = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button4));

	button5 = gtk_radio_button_new_with_label(group2, "Expert");
	gtk_box_pack_start(GTK_BOX(box2), button5, TRUE, TRUE, 0);
	gtk_widget_show(button5);

	box5 = gtk_vbox_new(FALSE, 0);
	gtk_container_add(GTK_CONTAINER(box4), box5);
	gtk_widget_show(box5);

	button6 = gtk_button_new_with_label ("Start Game");

	g_signal_connect (G_OBJECT (button6), "clicked", G_CALLBACK (startGame), NULL);

	gtk_box_pack_start(GTK_BOX (box5), button6, TRUE, TRUE, 0);

	gtk_widget_show(button6);
		
	gtk_widget_show(window);

	gtk_main();
}

static gboolean deleteEvent(GtkWidget *widget, GdkEvent *event, gpointer data)
{
	gtk_main_quit();
	return FALSE;
}

static int startGame(GtkWidget *widget, GdkEvent *event, gpointer data)
{
	if(gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(button)))
	{
		if(gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(button3)))
		{
			gamet = 1;
			gtk_main_quit();
		}
		if(gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(button4)))
		{
			gamet = 2;
			gtk_main_quit();

		}
		if(gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(button5)))
		{
			gamet = 3;
			gtk_main_quit();
		}	
	}

	if(gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(button2)))
	{
		gamet = 4;
		gtk_main_quit();
	}
}
#endif 


The error I get when I try to compile this is:
connect4menu2.h: In member function 'void menu::gui()':
connect4menu2.h:46: error: invalid use of member (did you forget the '&' ?)
connect4menu2.h:96: error: invalid use of member (did you forget the '&' ?)
I cannot understand why I can't call startGame and deleteEvent from gui.
Does anybody know why I am getting this error
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