please help: "setupUi: identifier not found"

[rrrrcem]

My problem is how to implement setupUi. It gives me "setupUi: identifier not found" error.
I do not know what do ı need to do now ??
please help !!

ı have 3 more classes but they have no relation with setupUi.

#ifndef UI_MYTREEWIDGET_H
#define UI_MYTREEWIDGET_H
 
#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QMainWindow>
#include <QtGui/QMenuBar>
#include <QtGui/QStatusBar>
#include <QtGui/QToolBar>
#include <QtGui/QWidget>
#include <QtGui>
 
class Ui_mytreewidgetClass
{
public:
    QMenuBar *menuBar;
    QToolBar *mainToolBar;
    QWidget *centralWidget;
    QStatusBar *statusBar;
 
 
 
  void Ui_mytreewidgetClass::setupUi(QMainWindow *mytreewidgetClass)
    {
 
	if (mytreewidgetClass->objectName().isEmpty())
    mytreewidgetClass->setObjectName(QString::fromUtf8("mytreewidgetClass"));
    mytreewidgetClass->resize(600, 400);
 
	menuBar = new QMenuBar(mytreewidgetClass);
    menuBar->setObjectName(QString::fromUtf8("menuBar"));
    mytreewidgetClass->setMenuBar(menuBar);
 
	mainToolBar = new QToolBar(mytreewidgetClass);
    mainToolBar->setObjectName(QString::fromUtf8("mainToolBar"));
    mytreewidgetClass->addToolBar(mainToolBar);
 
	centralWidget = new QWidget(mytreewidgetClass);
    centralWidget->setObjectName(QString::fromUtf8("centralWidget"));
    mytreewidgetClass->setCentralWidget(centralWidget);
 
	statusBar = new QStatusBar(mytreewidgetClass);
    statusBar->setObjectName(QString::fromUtf8("statusBar"));
    mytreewidgetClass->setStatusBar(statusBar);
 
    retranslateUi(mytreewidgetClass);
 
    QMetaObject::connectSlotsByName(mytreewidgetClass);
    } // setupUi
 
 
    void retranslateUi(QMainWindow *mytreewidgetClass)
    {
    mytreewidgetClass->setWindowTitle(QApplication::translate("mytreewidgetClass", "mytreewidget", 0, QApplication::UnicodeUTF8));
    Q_UNUSED(mytreewidgetClass);
    } // retranslateUi
 
 
};
 
namespace Ui {
    class mytreewidgetClass: public Ui_mytreewidgetClass {};
} // namespace Ui
 
#endif // UI_MYTREEWIDGET_H

#ifndef UI_MYTREEWIDGET_H
#define UI_MYTREEWIDGET_H

#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QMainWindow>
#include <QtGui/QMenuBar>
#include <QtGui/QStatusBar>
#include <QtGui/QToolBar>
#include <QtGui/QWidget>
#include <QtGui>

class Ui_mytreewidgetClass
{
public:
    QMenuBar *menuBar;
    QToolBar *mainToolBar;
    QWidget *centralWidget;
    QStatusBar *statusBar;



  void Ui_mytreewidgetClass::setupUi(QMainWindow *mytreewidgetClass)
    {
   
	if (mytreewidgetClass->objectName().isEmpty())
    mytreewidgetClass->setObjectName(QString::fromUtf8("mytreewidgetClass"));
    mytreewidgetClass->resize(600, 400);
   
	menuBar = new QMenuBar(mytreewidgetClass);
    menuBar->setObjectName(QString::fromUtf8("menuBar"));
    mytreewidgetClass->setMenuBar(menuBar);
    
	mainToolBar = new QToolBar(mytreewidgetClass);
    mainToolBar->setObjectName(QString::fromUtf8("mainToolBar"));
    mytreewidgetClass->addToolBar(mainToolBar);
    
	centralWidget = new QWidget(mytreewidgetClass);
    centralWidget->setObjectName(QString::fromUtf8("centralWidget"));
    mytreewidgetClass->setCentralWidget(centralWidget);
    
	statusBar = new QStatusBar(mytreewidgetClass);
    statusBar->setObjectName(QString::fromUtf8("statusBar"));
    mytreewidgetClass->setStatusBar(statusBar);

    retranslateUi(mytreewidgetClass);

    QMetaObject::connectSlotsByName(mytreewidgetClass);
    } // setupUi


    void retranslateUi(QMainWindow *mytreewidgetClass)
    {
    mytreewidgetClass->setWindowTitle(QApplication::translate("mytreewidgetClass", "mytreewidget", 0, QApplication::UnicodeUTF8));
    Q_UNUSED(mytreewidgetClass);
    } // retranslateUi


};

namespace Ui {
    class mytreewidgetClass: public Ui_mytreewidgetClass {};
} // namespace Ui

#endif // UI_MYTREEWIDGET_H

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#include <QtGui> 
#include "myqtapp.h"
 
 
 
//void setUi(QWidget *mytreewidgetClass);
 
 
 
 
 
myQtApp::myQtApp(QWidget *parent)
{
	setupUi( this ); // sets up GUI
}

#include <QtGui> 
#include "myqtapp.h"



//void setUi(QWidget *mytreewidgetClass);





myQtApp::myQtApp(QWidget *parent)
{
	setupUi( this ); // sets up GUI
}

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