Access violation -- qobject.cpp

[willief]

oh erh, I didn't know I was supposed to access them like that

#ifndef PRACTICE_H
#define PRACTICE_H
 
#include <QtGui/QMainWindow>
#include "ui_practice.h"
 
class practice : public QMainWindow, private Ui::practiceClass
{
	Q_OBJECT
 
public:
	practice(QWidget *parent = 0, Qt::WFlags flags = 0); 
 
public slots:
	void addItem();
	void removeItem();
 
private:
	Ui::practiceClass ui;
 
private slots:
 
	void init(); 
};
 
#endif // PRACTICE_H

#ifndef PRACTICE_H
#define PRACTICE_H

#include <QtGui/QMainWindow>
#include "ui_practice.h"

class practice : public QMainWindow, private Ui::practiceClass
{
	Q_OBJECT

public:
	practice(QWidget *parent = 0, Qt::WFlags flags = 0); 

public slots:
	void addItem();
	void removeItem();

private:
	Ui::practiceClass ui;

private slots:
	
	void init(); 
};

#endif // PRACTICE_H

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there is my header file.