can't create slot

[jthacker]

hi guys,

i'm working on a program in this i have ui form.
on the form i have created 9 app icons using list widget.
now i want to create a public slot in class QMainWindow
but when i wite the prototype of slot and build the project it gives me error
public slot:
void procFinished();

undefined reference to `MainWindow:rocFinished()'
error: collect2: ld returned 1 exit status

class MainWindow : public QMainWindow  {
    Q_OBJECT
 
public:
 
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
public slots:
    void procFinished();
 
protected:
    void changeEvent(QEvent *e);
 
    void showDate();
    void showTime();
    void timerEvent( QTimerEvent *e );
 
private:
    void run(const char* cmd);
 
    Ui::MainWindow *ui;
 
 
    QProcess *proc;
 
private slots:
 
    void on_pushButton_clicked();
    void on_listWidget_clicked(QModelIndex index);
 
};

class MainWindow : public QMainWindow  {
    Q_OBJECT

public:

    MainWindow(QWidget *parent = 0);
    ~MainWindow();
public slots:
    void procFinished();

protected:
    void changeEvent(QEvent *e);

    void showDate();
    void showTime();
    void timerEvent( QTimerEvent *e );

private:
    void run(const char* cmd);

    Ui::MainWindow *ui;


    QProcess *proc;

private slots:

    void on_pushButton_clicked();
    void on_listWidget_clicked(QModelIndex index);

};

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can anybody help me?


note: i'm using Qt Creator 1.3.1 based on Qt 4.6.2